Russian phonology

This article discusses the phonological system of standard Russian based on the Moscow dialect (unless otherwise noted). For discussion of other dialects, see Russian dialects. Most descriptions of Russian describe it as having five vowel phonemes, though there is some dispute over whether a sixth vowel, /ɨ/, is separate from /i/. Russian has 34 consonants, which can be divided into two sets:

• hard (твёрдый  [ˈtvʲɵrdɨj] ) or plain
• soft (мягкий  [ˈmʲæxʲkʲɪj]) or palatalized

Russian has vowel reduction in unstressed syllables. This feature is found in English, but not in most other Slavic languages, such as Polish, Czech, and Serbo-Croatian.

Vowels

Russian has five or six vowels in stressed syllables, /a e i o u/ and in some analyses /ɨ/, but only two or three vowels in unstressed syllables: /a i u/ after hard consonants and /i u/ after soft ones.

	Front	Central	Back
Close	i	(ɨ)	u
Mid	e		o
Open		a

A long-standing dispute among linguists is whether Russian has five vowel phonemes or six; that is, scholars disagree as to whether [ɨ] constitutes an allophone of /i/ or if there is an independent phoneme /ɨ/. The five-vowel analysis, taken up by the Moscow school, rests on the complementary distribution of [ɨ] and [i], with the former occurring after hard (non-palatalized) consonants and [i] elsewhere.

The six-vowel view, held by the Saint-Petersburg (Leningrad) phonology school, points to several phenomena to make its case:

• Native Russian speakers' ability to articulate [ɨ] in isolation: for example, in the names of the letters ⟨и⟩ and ⟨ы⟩.^[1]
• Rare instances of word-initial [ɨ], including the minimal pair икать 'to produce the sound и' and ыкать 'to produce the sound ы'),^[2] as well as borrowed names and toponyms, like Ыб  [ɨp] , the name of a river and several villages in the Komi Republic.
• Morphological alternations like готов  [ɡɐˈtof] ('ready' predicate, m.) and готовить  [ɡɐˈtovʲɪtʲ] ('to get ready' trans.) between palatalized and non-palatalized consonants.^[3]

The most popular view among linguists (and that taken up in this article) is that of the Moscow school,^[2] though Russian pedagogy has typically taught that there are six vowels (the term phoneme is not used).^[4]

Reconstructions of Proto-Slavic show that *i and *y (which correspond to [i] and [ɨ]) were separate phonemes. On the other hand, numerous alternations between the two sounds in Russian indicate clearly that at one point the two sounds were reanalyzed as allophones of each other.

Allophony

A quick index of vowel pronunciation

Phoneme	Letter (typically)	Position	Stressed	Reduced
/a/	а	(C)V	[ä], [ɑ]	[ə], [ɐ]
	я	CʲVC	[ä]	[ɪ]
		CʲVCʲ	[æ]
/o/	о	(C)V	[o̞ ~ ɔ]	[ə], [ɐ]
	ё*	CʲV	[ɵ]	[ɪ]
/e/	е	CʲVC	[ɛ̝]
	э	VC	[ɛ]
	э, е†	CVC		[ɪ̈]
		CVCʲ	[e]
/u/	у	(C)V	[ɵ]	[ʊ]
	ю	CʲV(C)
		CʲVCʲ	[ʉ]	[ʊ̈]
/i/	и	(Cʲ)V	[i]	[ɪ]
/ɨ/	ы, и	(C)V	[ɨ]	[ɪ̈]
* Reduced ⟨ё⟩ is written as ⟨е⟩. † ⟨е⟩ is used in most loans (except if word-initial) or after ц, ш, ж.

Russian vowels are subject to considerable allophony, subject to both stress and the palatalization of neighboring consonants. In most unstressed positions, in fact, only three phonemes are distinguished after hard consonants, and only two after soft consonants. Unstressed /a/ and /o/ merge (a phenomenon known as Russian: а́канье, tr. ákan'je); unstressed /e/ and /i/ merge (Russian: и́канье, tr. íkan'je); and all four unstressed vowels merge after soft consonants, except in absolute final position in a word. None of these mergers are represented in writing.

Front vowels

When a preceding consonant is hard, /i/ is retracted to [ɨ]. Formant studies in Padgett (2001) demonstrate that [ɨ] is better characterized as slightly diphthongized from the velarization of the preceding consonant,^[5] implying that a phonological pattern of using velarization to enhance perceptual distinctiveness between hard and soft consonants is strongest before /i/. When unstressed, /i/ becomes near-close; that is, [ɪ̈] following a hard consonant and [ɪ] in most other environments.^[6] Between soft consonants, both stressed and unstressed /i/ are raised,^[7] as in пить  [pʲi̝tʲ]  ('to drink') and маленький  [ˈmalʲɪ̝nʲkʲɪj] ('small'). When preceded and followed by coronal or dorsal consonants, [ɨ] is fronted to [ɨ̟].^[8] After a cluster of a labial and /l/, [ɨ] is retracted, as in плыть  [plɨ̠tʲ] ('to float'); it is also slightly diphthongized to [ɯ̟ɨ̟].^[8]

In native words, /e/ only follows unpaired (i.e. the retroflexes and /t͡s/) and soft consonants. After soft consonants (but not before), it is a mid vowel [ɛ̝] (hereafter represented without the diacritic for simplicity), while a following soft consonant raises it to close-mid [e]. Another allophone, an open-mid [ɛ] occurs word-initially and between hard consonants.^[9] Preceding hard consonants retract /e/ to [ɛ̠] and [e̠]^[10] so that жест ('gesture') and цель ('target') are pronounced  [ʐɛ̠st] and  [t͡se̠lʲ] respectively.

In words borrowed from other languages, /e/ rarely follows soft consonants; this foreign pronunciation often persists in Russian for many years until the word is more fully adopted into Russian.^[11] For instance, шофёр (from French chauffeur) was pronounced  [ʂoˈfɛr] in the early twentieth century,^[12] but is now pronounced  [ʂɐˈfʲɵr]. On the other hand, the pronunciations of words such as отель  [ɐˈtɛlʲ] ('hotel') retain the hard consonants despite a long presence in the language.

Back vowels

Between soft consonants, /a/ becomes [æ],^[13] as in пять  [pʲætʲ]  ('five'). When not following a soft consonant, /a/ is retracted to [ɑ̟] before /l/ as in палка  [ˈpɑ̟lkə] ('stick').^[13]

For most speakers, /o/ is a mid vowel [o̞], but it can be more open [ɔ] for some speakers.^[14] Following a soft consonant, /o/ is mid-centralized to close-mid central [ɵ] as in тётя  [ˈtʲɵtʲə] ('aunt').^[15][16]

As with the other back vowels, /u/ is centralized to [ʉ] between soft consonants, as in чуть  [t͡ɕʉtʲ] ('narrowly'). When unstressed, /u/ becomes near-close; central [ʉ̞] between soft consonants, centralized back [ʊ] in other positions.^[17]

Unstressed vowels

Russian unstressed vowels have lower intensity and lower energy. They are typically shorter than stressed vowels and tend to merge:^[18]

• /o/ and /a/ merge in most unstressed positions: for instance, валы 'bulwarks' and волы 'oxen' are both pronounced  [vɐˈlɨ] .
• Likewise, /e/ and /i/ merge in most unstressed positions: for instance, лиса 'fox' and леса 'forests' are both pronounced  [lʲɪˈsa].
• All four merge in most unstressed positions after soft consonants.

These mergers do not occur in all dialects. The merger of unstressed /e/ and /i/ in particular is less universal than that of unstressed /o/ and /a/; for example, speakers near the border with Belarus have the latter but not the former merger, distinguishing between лиса́ ('fox') and леса́ ('forests'), прожива́ть ('to reside') and прожева́ть ('to chew'), etc. The distinction between unstressed /e/ and /i/ is codified in some pronunciation dictionaries (Avanesov (1985:663), Zarva (1993:15)).

As a result, in most unstressed positions, only three vowel phonemes are distinguished after hard consonants (/u/, /a ~ o/, and /e ~ i/), and only two after soft consonants (/u/ and /a ~ o ~ e ~ i/). For the most part, Russian orthography (as opposed to that of closely related Belarusian) does not reflect vowel reduction.

Vowel mergers

In terms of actual pronunciation, there are at least two different levels of vowel reduction: vowels are less reduced when a syllable immediately precedes the stressed one, and more reduced in other positions.^[19] This is particularly visible in the realization of unstressed /o/ and /a/, where a less-reduced allophone [ɐ] contrasts with a more-reduced allophone [ə].

The pronunciation of unstressed /o ~ a/ is as follows:

1. [ɐ] (sometimes transcribed as [ʌ]; the former is phonetically correct for the standard Moscow pronunciation, whereas the latter is phonetically correct for the standard Saint Petersburg pronunciation;^[20] this article uses only the symbol [ɐ]) appears in the following positions:
   • In the syllable immediately before the stress, when a hard consonant precedes:^[21] паро́м  [pɐˈrom]  ('ferry'), трава́  [trɐˈva] ('grass').
   • In absolute word-initial position.^[22]
   • In hiatus, when the vowel occurs twice without a consonant between; this is written ⟨aa⟩, ⟨ao⟩, ⟨oa⟩, or ⟨oo⟩:^[22] сообража́ть  [sɐ.ɐbrɐˈʐatʲ] ('to use common sense, to reason').
2. [ə] appears elsewhere, when a hard consonant precedes: о́блако  [ˈobləkə] ('cloud').
3. When a soft consonant or /j/ precedes, both /o/ and /a/ merge with /i/ and are pronounced as [ɪ]. Example: язы́к  [jɪˈzɨk] 'tongue'). /o/ is written as ⟨e⟩ in these positions.
   • This merger also tends to occur after formerly soft consonants now pronounced hard (/ʐ/, /ʂ/, /t͡s/),^[23] where the pronunciation [ɪ̈] (which after /t͡s/ can be even lower [ɘ])^[24] occurs. This always occurs when the spelling uses the soft vowel variants, e.g. жена́  [ʐɪ̈ˈna]  ('wife'), with underlying /o/. However, it also occurs in a few word roots where the spelling writes a hard /a/.^[25][26] Examples:
     • жал- 'regret': e.g. жале́ть  [ʐɨˈlʲetʲ] ('to regret'), к сожалéнию  [ksəʐɨˈlʲenʲɪju] ('unfortunately').
     • ло́шадь 'horse', e.g. лошаде́й,  [ləʂɨˈdʲej] (pl. gen. and acc.).
     • -дцать- in numbers: e.g. двадцати́  [dvət͡sɨˈtʲi] ('twenty [gen., dat., prep.]'), тридцатью́  [trʲɪt͡sɨˈtʲju] ('thirty [instr.]').
     • ржано́й  [rʐɨˈnoj] ('rye [adj. m. nom.]').
     • жасми́н  [ʐɨˈsmʲin] ('jasmine').
4. These processes occur even across word boundaries as in под морем [pɐd‿ˈmorʲɪm] ('under the sea').

The pronunciation of unstressed /e ~ i/ is [ɪ] after soft consonants and /j/, and word-initially (эта́п  [ɪˈtap] ('stage')), but [ɪ̈] after hard consonants (дыша́ть  [dɪ̈ˈʂatʲ] ('to breathe')).

There are a number of exceptions to the above vowel-reduction rules:

• Vowels may not merge in foreign borrowings,^[27][28][29] particularly with unusual or recently borrowed words such as ра́дио,  [ˈradʲɪ.o]  'radio'. In such words, unstressed /a/ may be pronounced as [ɐ], regardless of context; unstressed /e/ does not merge with /i/ in initial position or after vowels, so word pairs like эмигра́нт and иммигра́нт, or эмити́ровать and имити́ровать, differ in pronunciation.
• Across certain word-final inflections, the reductions do not completely apply. For example, after soft or unpaired consonants, unstressed /a/, /e/ and /i/ of a final syllable may be distinguished from each other.^[30][31] For example, жи́тели  [ˈʐɨtʲɪlʲɪ] ('habitants') contrasts with both (о) жи́теле  [(o) ˈʐɨtʲɪlʲɛ] ('[about] a habitant') and жи́теля  [ˈʐɨtʲɪlʲə] ('of a habitant').
• If the first vowel of ⟨oa⟩, or ⟨oo⟩ belongs to the conjunctions но ('but') or то ('then'), it is not reduced, even when unstressed.^[32]

Other changes

Unstressed /u/ is generally pronounced as a lax (or near-close) [ʊ], e.g. мужчина  [mʊˈɕːinə]  ('man'). Between soft consonants, it becomes centralized to [ʉ̞], as in ютиться  [jʉ̞ˈtʲit͡sə] ('to huddle').

Note a spelling irregularity in /s/ of the reflexive suffix -ся: with a preceding -т- in third-person present and a -ть- in infinitive, it is pronounced as [t͡sə], i.e. hard instead of with its soft counterpart, since [t͡s], normally spelled with ⟨ц⟩, is traditionally always hard. In other forms both pronunciations [sə] and [sʲə] alternate for a speaker with some usual form-dependent preferences.^[33]

In weakly stressed positions, vowels may become voiceless between two voiceless consonants: выставка  [ˈvɨstə̥fkə] ('exhibition'), потому что  [pə̥tɐˈmu ʂtə] ('because'). This may also happen in cases where only the following consonant is voiceless: череп  [ˈt͡ɕerʲɪ̥p] ('skull').

Phonemic analysis

Because of mergers of different phonemes in unstressed position, the assignment of a particular phone to a phoneme requires phonological analysis. There have been different approaches to this problem:^[34]

• The Saint Petersburg phonology school assigns allophones to particular phonemes. For example, any [ɐ] is considered as a realization of /a/.
• The Moscow phonology school treats [ɐ] as either /a/ or /o/, depending on morphological alternations or etymology. To make a determination, one must seek out instances where an unstressed morpheme containing [ɐ] in one word is stressed in another word. Thus, if the word [vɐˈlɨ] ('shafts') shows an alternation with [val] ('shaft'), then this instance of [ɐ] is an allophone of /a/. Meanwhile, [vɐˈlɨ] ('oxen') alternates with [vol] ('ox'), showing that this instance of [ɐ] is an allophone of /o/. If there are no alternations between stressed and unstressed syllables for a particular morpheme, then the assignment is based on etymology.
• Some linguists^[35] prefer to avoid making the decision. Their terminology includes strong vowel phonemes (the five) for stressed vowels plus several weak phonemes for unstressed vowels: thus, [ɐ] represents the weak phoneme /ɐ/, which contrasts with other weak phonemes, but not with strong ones.

Diphthongs

Russian diphthongs all end in a non-syllabic [i̯], an allophone of /j/ and the only semivowel in Russian. In all contexts other than after a vowel, /j/ is considered an approximant consonant. Phonological descriptions of /j/ may also classify it as a consonant even in the coda. In such descriptions, Russian has no diphthongs.

The first part of diphthongs are subject to the same allophony as their constituent vowels. Examples of words with diphthongs: яйцо́  [jɪjˈt͡so]  ('egg'), ей  [jej] ('her' dat.), де́йственный  [ˈdʲejstvʲɪnnɨj] ('effective'). /ij/, written ⟨-ий⟩ or ⟨-ый⟩, is a common inflexional affix of adjectives, participles, and nouns, where it is often unstressed; at normal conversational speed, such unstressed endings may be monophthongized to [ɪ̟].^[36]

Consonants

⟨ʲ⟩ denotes palatalization, meaning the center of the tongue is raised during and after the articulation of the consonant. Phonemes that have at different times been disputed are enclosed in parentheses.

Consonant phonemes

		Labial		Dental, Alveolar		Post- alveolar	Palatal	Velar
		hard	soft	hard	soft	hard	soft	hard	soft
Nasal		m	mʲ	n	nʲ
Stop	voiced	b	bʲ	d	dʲ			ɡ	(ɡʲ)
	voiceless	p	pʲ	t	tʲ			k	(kʲ)
Affricate				t͡s	(t͡sʲ)		t͡ɕ
Fricative		f	fʲ	s	sʲ	ʂ	ɕː	x	(xʲ)
	voiced	v	vʲ	z	zʲ	ʐ	(ʑː)	(ɣ)
Approximant				l	lʲ		j
Trill					rʲ	r

Notes

• Most consonant phonemes come in hard–soft pairs (exceptions are listed below). There is a marked tendency of Russian hard consonants to be velarized, though this is a subject of some academic dispute.^[37][38] Velarization is clearest before the front vowels /e/ and /i/.^[39][40]

• • /ʐ/ and /ʂ/ are always hard in native words (even if spelling contains a "softening" letter after them, as in жена, шёлк, жить, мышь, жюри, парашют etc.), and for most speakers also in foreign proper names, mostly of French or Lithuanian origin (e.g. Гёльджюк [ˈɡʲɵlʲdʐʊk], Жён Африк [ˈʐon ɐˈfrʲik], Жюль Верн [ˈʐulʲ ˈvɛrn], Герхард Шюрер [ˈɡʲɛrxərt ˈʂurɨr], Шяуляй, Шяшувис).^[41] Long phonemes /ʑː/ and /ɕː/ do not pattern in the same ways that other hard–soft pairs do.

• • /t͡s/ is generally listed among the always-hard consonants, however certain foreign proper names, including those of Ukrainian, Polish, Lithuanian, or German origin (e.g. Цюрупа, Пацюк, Цявловский, Цюрих), as well as loanwords (e.g., хуацяо, from Chinese) contain a soft [t͡sʲ].^[42] The phonemicity of a soft /t͡sʲ/ is supported by neologisms that come from native word-building processes (e.g. фрицёнок, шпицята). However, according to Yanushevskaya & Bunčić (2015), /t͡s/ really is always hard, and realizing it as palatalized [t͡sʲ] is considered "emphatically non-standard", and occurs only in some regional accents.^[43]
  • /t͡ɕ/ and /j/ are always soft.
  • /ɕː/ is also always soft. A formerly common pronunciation of /ɕ/+/t͡ɕ/^[44] indicates the sound may be two underlying phonemes: /ʂ/ and /t͡ɕ/, thus /ɕː/ can be considered as a marginal phoneme. In today's most widespread pronunciation, [ɕt͡ɕ] appears (instead of [ɕː]) for orthographical -зч-/-сч- where ч- starts a words's root, and -з/-с belongs to a preposition or a "clearly distinguishable" prefix (e.g. без часов  [bʲɪɕt͡ɕɪˈsof] , 'without a clock'; расчертить  [rɐɕt͡ɕɪrˈtʲitʲ], 'to rule'); in all other cases /ɕː/ is used (щётка [ˈɕːɵtkə], грузчик [ˈɡruɕːɪk], переписчик [pʲɪrʲɪˈpʲiɕːɪk], счастье [ˈɕːæsʲtʲjə], мужчина [mʊˈɕːinə], исщипать [ɪɕːɪˈpatʲ], расщепить [rəɕːɪˈpʲitʲ] etc.)
  • The marginal^[45] phoneme /ʑː/ is used only by speakers of the conservative Moscow accent, and is somewhat obsolete. The modern pronunciation of this sound is hard [ʐː].^[46] This sound may derive from an underlying /zʐ/ or /sʐ/. For more information, see alveolo-palatal consonant and retroflex consonant.
• /ʂ/ and /ʐ/ are somewhat concave apical postalveolar.^[47] They may be described as retroflex, e.g. by Hamann (2004), but this is to indicate that they are not laminal nor palatalized; not to say that they are subapical.^[48]
• Hard /t, d, n/ are laminal denti-alveolar [t̪, d̪, n̪]; unlike in many other languages, /n/ does not become velar [ŋ] before velar consonants.^[49]
• Hard /l/ has been variously described as pharyngealized apical alveolar [l̺ˤ]^[50] and velarized laminal denti-alveolar [l̪ˠ].^[38][51][52] Because of that, some scholars^[53] transcribe it /ɫ/ even in phonemic transcription. This article uses /l/ for simplicity.
• Hard /r/ is postalveolar, typically a trill [r̠].^[54]
• Soft /rʲ/ is an apical dental tap [ɾ̪ʲ] or, less often, an apical dental trill [r̪ʲ].^[54]
• Soft /tʲ, dʲ, nʲ/ are laminal alveolar [t̻ʲ^sʲ, d̻ʲ^zʲ, n̻ʲ]; as indicated in the transcription, in case of the first two the tongue is raised enough to produce slight frication.^[55]
• Soft /lʲ/ is either laminal alveolar [l̻ʲ] or laminal denti-alveolar [l̪ʲ].^[50][56]
• /t͡s, s, sʲ, z, zʲ/ are dental [t̪͡s̪, s̪, s̪ʲ, z̪, z̪ʲ],^[57] i.e. dentalized laminal alveolar. They are pronounced with the blade of the tongue very close to the upper front teeth, with the tip of the tongue resting behind lower front teeth.
• A marginal phoneme /ɣ/ occurs instead of /a/ in certain interjections: ага, ого, угу, эге, о-го-го, э-ге-ге, гоп. (Thus, there exists a minimal pair of homographs: ага  [ɐˈɣa]  'aha!' vs ага  [ɐˈɡa] 'agha'). The same sound [ɣ] can be found in бухгалтер (spelled ⟨хг⟩, though in цейхгауз, ⟨хг⟩ is [x]), optionally in габитус and in a few other loanwords. Also optionally (and less frequently than a century ago) [ɣ] can be used instead of [ɡ] in certain religious words (a phenomenon influenced by Church Slavonic pronunciation): Бога, Богу... (declension forms of Бог 'God'), Господь 'Lord' (especially in the exclamation Господи! 'Oh Lord!'), благой 'good'.
• Some linguists (like I. G. Dobrodomov and his school) postulate the existence of a phonemic glottal stop /ʔ/. This marginal phoneme can be found, for example, in the word не-а  [ˈnʲeʔə] . Claimed minimal pairs for this phoneme include суженный  [ˈsʔuʐɨnɨj] 'narrowed' (a participle from сузить 'to narrow', with prefix с- and root -уз-, cf. узкий 'narrow') vs суженый  [ˈsuʐɨnɨj] 'betrothed' (originally a participle from судить 'to judge', now an adjective; the root is суд 'court') and с Аней  [ˈsʔanʲɪj] 'with Ann' vs Саней  [ˈsanʲɪj] '(by) Alex'.^[58][59]

There is some dispute over the phonemicity of soft velar consonants. Typically, the soft–hard distinction is allophonic for velar consonants: they become soft before front vowels, as in короткий  [kɐˈrotkʲɪj] ('short'), unless there is a word boundary, in which case they are hard (e.g. к Ивану  [k ‿ɨvanu] 'to Ivan').^[60] Hard variants occur everywhere else. Exceptions are represented mostly by:

• Loanwords:
  • Soft: гёзы, гюрза́, гяу́р, секью́рити, кекс, кяри́з, са́нкхья, хянга́;
  • Hard: кок-сагы́з, гэ́льский, акы́н, кэб (кеб), хэ́ппенинг.
• Proper nouns of foreign origin:
  • Soft: Алигье́ри, Гёте, Гю́нтер, Гянджа́, Джокьяка́рта, Кёнигсберг, Кюраса́о, Кя́хта, Хью́стон, Хёндэ, Хю́бнер, Пюхяя́рви;
  • Hard: Мангышла́к, Гэ́ри, Кызылку́м, Кэмп-Дэ́вид, Архы́з, Хуанхэ́.

The rare native examples are fairly new, as most them were coined in the last century:

• Soft: forms of the verb ткать 'weave' (ткёшь, ткёт etc., and derivatives like соткёшься); догёнок/догята, герцогёнок/герцогята; and adverbial participles of the type берегя, стерегя, стригя, жгя, пекя, секя, ткя (it is disputed whether these are part of the standard language or just informal colloquialisms);
• Hard: the name гэ of letter ⟨г⟩, acronyms and derived words (кагебешник, днепрогэсовский), a few interjections (гы, кыш, хэй), some onomatopoeic words (гыгыкать), and colloquial forms of certain patronyms: Олегыч, Маркыч, Аристархыч (where -ыч is a contraction of standard language's patronymical suffix -ович rather than a continuation of ancient -ич).

In the mid-twentieth century, a small number of reductionist approaches made by structuralists^[61] put forth that palatalized consonants occur as the result of a phonological processes involving /j/ (or palatalization as a phoneme in itself), so that there were no underlying palatalized consonants.^[62] Despite such proposals, linguists have long agreed that the underlying structure of Russian is closer to that of its acoustic properties, namely that soft consonants are separate phonemes in their own right.^[63]

Phonological processes

Final devoicing

Voiced consonants (/b/, /bʲ/, /d/, /dʲ/ /ɡ/, /v/, /vʲ/, /z/, /zʲ/, /ʐ/, and /ʑː/) are devoiced word-finally unless the next word begins with a voiced obstruent.^[64] /a/, in addition to becoming voiceless, also lenites to [x] in some words, such as бог [ˈbox].

Voicing

Russian features general regressive assimilation of voicing and palatalization.^[65] In longer clusters, this means that multiple consonants may be soft despite their underlyingly (and orthographically) being hard.^[66] The process of voicing assimilation applies across word-boundaries when there is no pause between words.^[67] Within a morpheme, voicing is not distinctive before obstruents (except for /v/, and /vʲ/ when followed by a vowel or sonorant). The voicing or devoicing is determined by that of the final obstruent in the sequence:^[68] просьба  [ˈprozʲbə]  ('request'), водка  [ˈvotkə] ('vodka'). In foreign borrowings, this isn't always the case for /f(ʲ)/, as in Адольф Гитлер  [ɐˈdolʲf ˈɡʲitlʲɪr] ('Adolf Hitler') and граф болеет ('the count is ill'). /v/ and /vʲ/ are unusual in that they seem transparent to voicing assimilation; in the syllable onset, both voiced and voiceless consonants may appear before /v(ʲ)/:

• тварь  [tvarʲ]) ('the creature')
• два  [dva] ('two')
• световой  [s(ʲ)vʲɪtɐˈvoj] ('of light')
• звезда  [z(ʲ)vʲɪˈzda] ('star')

When /v(ʲ)/ precedes and follows obstruents, the voicing of the cluster is governed by that of the final segment (per the rule above) so that voiceless obstruents that precede /v(ʲ)/ are voiced if /v(ʲ)/ is followed by a voiced obstruent (e.g. к вдове [ɡvdɐˈvʲɛ] 'to the widow') while a voiceless obstruent will devoice all segments (e.g. без впуска [bʲɪs ˈfpuskə] 'without an admission').^[69]

/t͡ɕ/, /t͡s/, and /x/ have voiced allophones ([d͡ʑ], [d͡z] and [ɣ]) before voiced obstruents,^[64][70] as in дочь бы  [ˈdod͡ʑ bɨ]^[71] ('a daughter would') and плацдарм  [plɐd͡zˈdarm] ('bridge-head').

Other than /mʲ/ and /nʲ/, nasals and liquids devoice between voiceless consonants or a voiceless consonant and a pause: контрфорс  [ˌkontr̥ˈfors]) ('buttress').^[72]

Palatalization

Before /j/, paired consonants are normally soft as in пью  [pʲju]  'I drink' and пьеса  [ˈpʲjɛsə] 'theatrical play'. However the last consonant of prefixes and parts of compound words generally remains hard in the standard language: отъезд  [ɐˈtjest] 'departure', Минюст  [ˌmʲiˈnjust] 'Min[istry of] Just[ice]'; and only when prefix ends in /s/ or /z/, there exists an optional softening: съездить  [ˈs(ʲ)jezʲdʲɪtʲ] ('to travel').

Paired consonants preceding /e/ are also soft; although there are exceptions from loanwords, alternations across morpheme boundaries are the norm.^[73] The following examples^[74] show some of the morphological alternations between a hard consonant and its soft counterpart:

hard	soft
[dom] дом 'house' (nom)	[ˈdomʲɪ] до́ме 'house' (prep)
[krɐˈvavɨj] крова́вый 'bloody'	[krɐˈvavʲɪtʲ] крова́веть 'to become bloody'
[ɐˈtvʲet] отве́т 'answer'	[ɐˈtvʲetʲɪtʲ] отве́тить 'to answer'
[(ja) nʲɪˈsu] (я) несу́ 'I carry'	[nʲɪˈsʲɵt] (он, она, оно) несёт 'carries'
[ʐɨˈna] жена́ 'wife'	[ˈʐɛnʲɪn] Же́нин 'Eugene's'
[kɐˈrovə] коро́ва 'cow'	[kɐˈrovʲɪj] коро́вий 'bovine'
	[prʲɪmʲɪˈzna] прямизна́ 'straightness'
[vor] вор ('thief')	[vɐˈrʲiʂkə] вори́шка 'little thief (pejorative)'
[nəpʲɪˈsal] написа́л 'he wrote'	[nəpʲɪˈsalʲɪ] написа́ли 'they wrote'
[ɡɐrˈbun] горбу́н 'hunchback'	[ɡɐrˈbunʲjə] горбу́нья 'female hunchback'
[vɨˈsok] высо́к '(is) high'	[vɨsʲ] высь 'height'

Velar consonants are soft when preceding /i/; within words, this means that velar consonants are never followed by [ɨ].^[75]

Before hard dental consonants, /r/, labial and dental consonants are hard: орла  [ɐrˈla] ('eagle' gen. sg).

Assimilative palatalization

Paired consonants preceding another consonant often inherit softness from it. This phenomenon in literary language has complicated and evolving rules with many exceptions, depending on what these consonants are, in what morphemic position they meet and to what style of speech the word belongs. In old Moscow pronunciation, softening was more widespread and regular; nowadays some cases that were once normative have become low colloquial or archaic. In fact, consonants can be softened to very different extent, become semi-hard or semi-soft.

The more similar the consonants are, the more they tend to soften each other. Also, some consonants tend to be softened less, such as labials and /r/.

Softening is stronger inside the word root and between root and suffix; it is weaker between prefix and root and weak or absent between a preposition and the word following.^[76]

• Before soft dental consonants, /lʲ/ and often soft labial consonants, dental consonants (other than /t͡s/) are soft.
• /x/ is assimilated to the palatalization of the following velar consonant: лёгких  [ˈlʲɵxʲkʲɪx] ) ('lungs' gen. pl.).
• Palatalization assimilation of labial consonants before labial consonants is in free variation with nonassimilation, that is бомбить ('to bomb') is either [bɐmˈbʲitʲ] or [bɐmʲˈbʲitʲ] depending on the individual speaker.
• When hard /n/ precedes its soft equivalent, it is also soft and likely to form a single long sound (see gemination). This is slightly less common across affix boundaries.

In addition to this, dental fricatives conform to the place of articulation (not just the palatalization) of following postalveolars: с частью  [ˈɕːæsʲtʲju]) ('with a part'). In careful speech, this does not occur across word boundaries.

Russian has the rare feature of nasals not typically being assimilated in place of articulation. Both /n/ and /nʲ/ appear before retroflex consonants: деньжонки  [dʲɪnʲˈʐonkʲɪ]) ('money' (scornful)) and ханжой  [xɐnˈʐoj]) ('sanctimonious one' instr.). In the same context, other coronal consonants are always hard.

Consonant clusters

As a Slavic language, Russian has fewer phonotactic restrictions on consonants than many other languages,^[77] allowing for clusters that would be difficult for English speakers; this is especially so at the beginning of a syllable, where Russian speakers make no sonority distinctions between fricatives and stops.^[78] These reduced restrictions begin at the morphological level; outside of two morphemes that contain clusters of four consonants: встрет-/встреч- 'meet' ([ˈfstretʲ/ˈfstret͡ɕ]), and чёрств-/черств- 'stale' ([ˈt͡ɕɵrstv]), native Russian morphemes have a maximum consonant cluster size of three:^[79]

3-Segment clusters

	Russian	IPA/Audio	Translation
CCL	скрип		'squeak'
CCC*	ствол	[stvol]	'tree trunk'
LCL	верблюд	[vʲɪrˈblʲut]	'camel'
LCC	толстый	[ˈtolstɨj]	'thick'

For speakers who pronounce [ɕt͡ɕ] instead of [ɕː], words like общий ('common') also constitute clusters of this type.

2-Segment clusters

	Russian	IPA/Audio	Translation
CC	кость	[kosʲtʲ]	'bone'
LC	ртуть		'mercury'
CL	слепой	[slʲɪˈpoj]	'blind'
LL	горло	[ˈɡorlə]	'throat'
CJ	дьяк		'dyak'
LJ	рьяный	[ˈrʲjanɨj]	'zealous'

If /j/ is considered a consonant in the coda position, then words like айва ('quince') contain semivowel+consonant clusters.

Affixation also creates consonant clusters. Some prefixes, the best known being вз-/вс- ([vz-]/[fs-]), produce long word-initial clusters when they attach to a morpheme beginning with consonant(s) (e.g. |fs|+ |pɨʂkɐ| → вспышка [ˈfspɨʂkɐ] 'flash'). However, the four-consonant limitation persists in the syllable onset.^[80][81]

Clusters of three or more consonants are frequently simplified, usually through syncope of one of them,^[82] especially in casual pronunciation.^[83] Various cases of relaxed pronunciation in Russian can be seen here.

All word-initial four-consonant clusters begin with [vz] or [fs], followed by a stop (or, in the case of [x], a fricative), and a liquid:

4-Segment clusters

Russian	IPA/Audio	Translation
(ему) взбрело (в голову)		'(he) took it (into his head)'
взгляд	[ˈvzɡlʲat]	'gaze'
взгромоздиться	[vzɡrəmɐˈzʲdʲitsə]	'to perch'
вздрогнуть	[ˈvzdroɡnʊtʲ]	'to flinch'
всклокоченный	[fsklɐˈkot͡ɕɪnːɨj]	'disheveled'
вскрыть		'to unseal'
всплеск		'splash'
вспрыгнуть	[ˈfsprɨɡnʊtʲ]	'to jump up'
встлеть		'to begin to smolder'
встречать	[fstrʲɪˈt͡ɕætʲ]	'to meet'
всхлип		'whimper'
всхрапывать	[ˈfsxrapɨvətʲ]	'to snort'

Because prepositions in Russian act like clitics,^[84] the syntactic phrase composed of a preposition (most notably, the three that consist of just a single consonant: к, с, and в) and a following word constitutes a phonological word that acts like a single grammatical word.^[85] For example, the phrase с друзья́ми ('with friends') is pronounced [zdrʊˈzʲjæmʲɪ]. In the syllable coda, suffixes that contain no vowels may increase the final consonant cluster of a syllable (e.g. Ноябрьск 'city of Noyabrsk' |noˈjabrʲ|+ |sk| → [nɐˈjabrʲsk]), theoretically up to seven consonants: *монстрств [ˈmonstrstf] ('of monsterships').^[86] There is usually an audible release between these consecutive consonants at word boundaries, the major exception being clusters of homorganic consonants.^[87]

Consonant cluster simplification in Russian includes degemination, syncope, dissimilation, and weak vowel insertion. For example, /sɕː/ is pronounced [ɕː], as in расщелина ('cleft'). There are also a few isolated patterns of apparent cluster reduction (as evidenced by the mismatch between pronunciation and orthography) arguably the result of historical simplifications.^[88] For example, dental stops are dropped between a dental continuant and a dental nasal or lateral: лестный [ˈlʲesnɨj] 'flattering'.^[89] Other examples include:

/vstv/ > [stv]	чувство	'feeling'	[ˈtɕustvə] (not [ˈtɕʉfstvə])	[88]
/lnt͡s/ > [nt͡s]	солнце	'sun'	[ˈsont͡sə] (not [ˈsolnt͡sə])	[88]
/rdt͡s/ > [rt͡s]	сердце	'heart'	[ˈsʲert͡sə] (not [ˈsʲertt͡sə])
/rdt͡ɕ/ > [rt͡ɕ]	сердчишко	'heart' (diminutive)
/ndsk/ > [nsk]	шотландский	'Scottish'	[ʂɐtˈlanskʲɪj] (not [ʂɐtˈlantskʲɪj])	[88]
/stsk/ > [sk]	марксистский	'Marxist'		[88]

The simplifications of consonant clusters are done selectively; bookish-style words and proper nouns are typically pronounced with all consonants even if they fit the pattern. For example, the word голландка is pronounced in a simplified manner [ɡɐˈlankə] for the meaning of 'Dutch oven' (a popular type of oven in Russia) and in a full form [ɡɐˈlantkə] for 'Dutch woman' (a more exotic meaning).

In certain cases, this syncope produces homophones, e.g. костный ('bony') and косный ('rigid'), both are pronounced  [ˈkosnɨj].

Another method of dealing with consonant clusters is inserting an epenthetic vowel (both in spelling and in pronunciation), ⟨о⟩, after most prepositions and prefixes that normally end in a consonant. This includes both historically motivated usage and cases of its modern extrapolations. There are no strict limits when the epenthetic ⟨о⟩ is obligatory, optional, or prohibited. One of the most typical cases of the epenthetic ⟨о⟩ is between a morpheme-final consonant and a cluster starting with the same or similar consonant (e.g. со среды 'from Wednesday' |s|+ |srʲɪˈdɨ| → [səsrʲɪˈdɨ], not *с среды; ототру 'I'll scrub' |ot|+ |ˈtru| → [ɐtɐˈtru], not *оттру).

Supplementary notes

There are numerous ways in which Russian spelling does not match pronunciation. The historical transformation of /a/ into /v/ in genitive case endings and the word for 'him' is not reflected in the modern Russian orthography: the pronoun его [jɪˈvo] 'his/him', and the adjectival declension suffixes -ого and -его. Orthographic г represents /x/ in a handful of word roots: легк-/лёгк-/легч- 'easy' and мягк-/мягч- 'soft'. There are a handful of words in which consonants which have long since ceased to be pronounced even in careful pronunciation are still spelled, e.g., the 'l' in солнце [ˈsont͡sə] ('sun').

/n/ and /nʲ/ are the only consonants that can be geminated within morpheme boundaries. Such gemination does not occur in loanwords.

Between any vowel and /i/ (excluding instances across affix boundaries but including unstressed vowels that have merged with /i/), /j/ may be dropped: аист [ˈa.ɪst] ('stork') and делает [ˈdʲɛləɪt] ('does').^[90] (Halle (1959) cites заезжать and other instances of intervening prefix and preposition boundaries as exceptions to this tendency.)

Stress in Russian may fall on any syllable and words can contrast based just on stress (e.g. мука [ˈmukə] 'ordeal, pain, anguish' vs. [mʊˈka] 'flour, meal, farina'); stress shifts can even occur within an inflexional paradigm: до́ма [ˈdomə] ('house' gen. sg.) vs дома́ [dɐˈma] ('houses'). The place of the stress in a word is determined by the interplay between the morphemes it contains, as some morphemes have underlying stress, while others do not. However, other than some compound words, such as морозоустойчивый [mɐˌrozəʊˈstojtɕɪvɨj] ('frost-resistant') only one syllable is stressed in a word.^[91]

/ɨ/ velarizes hard consonants: ты  [tˠɨ]  ('you' sing.). /o/ and /u/ velarize and labialize hard consonants and labialize soft consonants: бок  [bˠʷok] ('side'), нёс  [nʲʷɵs] ('(he) carried').^[92]

Between a hard consonant and /o/, a slight [w] offglide occurs, most noticeably after labial, labio-dental and velar consonants (e.g. мок, 'side' [mˠwok]).^[93] Similarly, a weak palatal offglide may occur between certain soft consonants and back vowels (e.g. ляжка 'thigh' [ˈlʲjaʂkə]).^[94]

Historical sound changes

The modern phonological system of Russian is inherited from Common Slavonic but underwent considerable innovation in the early historical period before it was largely settled by about 1400.

Like other Slavic languages, Old Russian was a language of open syllables.^[95] All syllables ended in vowels and consonant clusters, with far less variety than today, existed only in the syllable onset. However, by the time of the earliest records, Old Russian already showed characteristic divergences from Common Slavonic.

Around the tenth century, Russian may have already had paired coronal fricatives and sonorants so that /s/ /z/ /n/ /l/ /r/ could have contrasted with /sʲ/ /zʲ/ /nʲ/ /lʲ/ /rʲ/, but any possible contrasts were limited to specific environments.^[95] Otherwise, palatalized consonants appeared allophonically before front vowels.^[96] When the yers were lost, the palatalization initially triggered by high vowels remained,^[97] creating minimal pairs like данъ /dan/ ('given') and дань /danʲ/ ('tribute'). At the same time, [ɨ], which was already a part of the vocalic system, was reanalyzed as an allophone of /i/ after hard consonants, prompting leveling that caused vowels to alternate according to the preceding consonant rather than vice versa.^[98]

The nasal vowels (spelled in the Cyrillic alphabet with yuses), which had developed from Common Slavic *eN and *oN before a consonant, were replaced with nonnasalized vowels, possibly iotated or with softening of the preceding consonant:

• PIE: *h₁sónti
• Latin: sunt
• Common Slavonic: *sǫtь
• Old Church Slavonic: sǫtь
• Russian: суть  [sutʲ]  ('they are', bookish 3rd person pl form of быть 'to be', cf. Polish są).^[99]

Borrowings in the Uralic languages with interpolated /n/ after Common Slavonic nasal vowels have been taken to indicate that the nasal vowels existed in East Slavic until some time possibly just before the historical period.

Simplification of Common Slavic *dl and *tl to *l:^[100]

• Common Slavonic: *mydlo
• Polish: mydło
• Russian: мыло  [ˈmɨlə]  ('soap').

A tendency for greater maintenance of intermediate ancient [-ɡ-], [-k-], etc. before frontal vowels, than in other Slavic languages, the so-called incomplete second and third palatalizations:

• Ukrainian нозі /nozʲi/
• Russian: ноге [nɐˈɡʲe] ('leg' dat.).

Pleophony or "full-voicing" (polnoglasie, полногласие [pəlnɐˈɡlasʲɪɪ]), that is, the addition of vowels on either side of /l/ and /r/ between two consonants. Church Slavonic influence has made it less common in Russian than in modern Ukrainian and Belarusian:

• Old Church Slavonic: vrabii *[ˈvrabii]
• Russian: воробей  [vərɐˈbʲej]  ('sparrow')
• Ukrainian: Володимир /woloˈdɪmɪr/
• Russian: Владимир  [vlɐˈdʲimʲɪr] ('Vladimir') (although the nickname form in Russian is still Володя [vɐˈlodʲə]).

Major phonological processes in the last thousand years have included the absence of the Slavonic open-syllable requirement, achieved in part through the loss of the ultra-short vowels, the so-called fall of the yers, which alternately lengthened and dropped (the yers are given conventional transcription rather than precise IPA symbols in the Old Russian pronunciations):

• Old East Slavic: объ мьнѣ /obŭ mĭˈně/ > R: обо мне [əbɐ ˈmnʲe] ('about me')
• OR: сънъ /ˈsŭnŭ/ > R: сон  [son] ('sleep' nom. sg.), cognate with Lat. somnus;
• OR: съна /sŭˈna/ > R: сна  [sna] ('of sleep') (gen. sg.).

The loss of the yers has led to geminated consonants and a much greater variety of consonant clusters, with attendant voicing and/or devoicing in the assimilation:

• OR: къдѣ /kŭˈdě/ > R: где  [ɡdʲe] ('where').

Consonant clusters thus created were often simplified:

• здравствуйте  [ˈzdrastvujtʲə]  ('hello'), (first 'v' rarely pronounced; such a pronunciation could be affected in the archaic meaning be healthy)
• сердце [ˈsʲert͡sə] ('heart') ('d' not pronounced)
• солнце [ˈsont͡sə] ('sun') ('l' not pronounced).

The development of OR ѣ ě (conventional transcription) into /(j)e/, as seen above. This development has caused by far the greatest of all Russian spelling controversies. The timeline of the development of ě into /e/ or /je/ has also been debated.

Sometime between the twelfth and fourteenth centuries, the allophone of /i/ before velar consonants changed from [ɨ] to [i] with subsequent palatalization of the velars.^[75]

The retroflexing of postalveolars: /ʒ/ became [ʐ] and /ʃ/ become [ʂ]. This is considered a "hardening" since retroflex sounds are difficult to palatalize. At some point, /t͡s/ resisted palatalization, which is why it is also "hard" although phonetically, it is no different from before. The sound represented by ⟨щ⟩ was much more commonly pronounced /ɕt͡ɕ/ than it is today. Today's common and standard pronunciation of ⟨щ⟩ is /ɕː/.

The development of stressed /e/ into /o/ when between a (historically) soft consonant and a hard one.^[16][101]

• OR о чемъ /o ˈt͡ʃemŭ/ ('about which' loc. sg.) > R о чём [ɐ ˈt͡ɕɵm].

That has led to a number of alternations:^[102]

Word	Gloss	Word	Gloss
весе́лье	merriment	весёлый	merry
вле́чь	to attract	влёк	he was attracting
деше́вле	cheaper	дешёвый	cheap
е́ль	fir-tree	ёлка	Christmas tree
жечь	to burn	жёг	he burned
коле́сник	wheel-wright	колёса	wheels
лечь	to lie down	лёг	he lay down
Пе́тя	Pete	Пётр	Peter
поме́лья	brooms	мёл	he swept
сельский	rural	сёла	villages
се́стрин	sister's	сёстры	sisters
смерть	death	мёртвый	dead
шесть	six	сам-шёст	six-fold; with five others

Note that the /e/ that derives from the long obsolete vowel, yat (ѣ) did not undergo this change except for a short list of words as of about a century ago. Nowadays, the change has been reverted in two of those exceptional words.

• вдёжка 'threading needle, bodkin'
• гнёзда 'nests'
• желёзка 'glandule' (however желе́зка 'piece of iron')
• запечатлён '[he/it is] depicted; [he/it is] imprinted (in the mind)'
• звёзды 'stars'
• зёвывал '[he] used to yawn'
• издёвка 'jibe'
• (ни разу не) надёван '[it is] (never) worn'
• обрёл '[he] found'
• сёдла 'saddles'
• смётка 'apprehension'
• цвёл '[he] flowered, flourished'
• надёвывал '[he] used to put on' (this word has fallen into disuse in the standard language)
• подгнёта 'fuel, chips; instigation; firebrand' (this word has fallen into disuse in the standard language)
• вёшка 'way-mark' (now ве́шка)
• медвёдка 'mole cricket', 'mole rat' (now медве́дка)

Loanwords from Church Slavonic reintroduced /e/ between a (historically) soft consonant and a hard one, creating a few new minimal pairs:^[103]

• не́бо 'sky' vs. нёбо 'roof of the mouth'
• паде́ж 'case (grammatical)' vs. падёж 'murrain, epizooty'
• вселе́нная 'universe' vs. вселённая 'settled' (f.)
• соверше́нный 'perfect' vs. совершённый 'completed, committed, performed, achieved'

A number of the phonological features of Russian are attributable to the introduction of loanwords (especially from non-Slavic languages), including:

• Sequences of two vowels within a morpheme.^[104] Only a handful of such words, like паук 'spider' and оплеуха 'slap in the face' are native.
  • поэт [pɐˈɛt] 'poet'. From French poète.
  • траур [ˈtraur] 'mourning'. From German Trauer.
• Word-initial /e/, except for the root эт-.^[104]
  • эра [ˈɛrə] 'era'. From German Ära
• Word-initial /a/.^[104]
  • авеню [ɐvʲɪˈnʲu] 'avenue. From French avenue.
  • афера [ɐˈfʲerə] 'swindle'. From French affaire.
  • агнец 'lamb'. From Church Slavonic
• The phoneme /f/ (see Ef (Cyrillic) for more information).^[104][104]
  • фонема [fɐˈnɛmə] 'phoneme'. From Greek φώνημα.
  • эфир [eˈfʲir] 'ether'. From Greek αἰθήρ.
  • фиаско [fʲɪˈaskə] 'fiasco'. From Italian fiasco.
• The occurrence of non-palatalized consonants before /e/ within roots.^[104] (The initial /e/ of a suffix or flexion invariably triggers palatalization of an immediately preceding consonant, as in брат / братец / о брате.)^[105]
• The sequence /dʐ/ within a morpheme.^[106]
  • джин  [dʐɨn] ) 'gin' from English.
  • джаз [dʐas] 'jazz' from English.

Many double consonants have become degeminated but are still written with two letters.

(In a 1968 study, long [tː] remains long in only half of the words in which it appears written, but long [fː] did so only a sixth of the time. The study, however, did not distinguish spelling from actual historical pronunciation, since it included loanwords in which consonants were written doubled but never pronounced long in Russian.)^[107]

See also

• Help:IPA for Russian
• Russian alphabet
• Russian orthography
  • Reforms of Russian orthography
• List of Russian language topics
• Index of phonetics articles

References

Bibliography

Further reading