Russian orthography

Morphological principle

Under the morphological principle, the morphemes (roots, suffixes, infixes, and inflexional endings) are attached without modification; the compounds may be further agglutinated. For example, the long adjective шарикоподшипниковый, sharikopodshipnikoviy [ʂarʲɪkəpɐtˈʂɨpnʲɪkəvɨj] ('pertaining to ball bearings'), may be decomposed as follows (words having independent existence in boldface):

Note again that each component in the final production retains its basic form, despite the vowel reduction.

The phonetic assimilation of consonant clusters also does not usually violate the morphological principle of the spelling. For example, the decomposition of счастье [ˈɕːasʲtʲjɪ] ('happiness, good fortune') is as follows:

Note the assimilation with ⟨сч⟩- so that it represents the same sound (or cluster) as ⟨щ⟩-. The spelling <щастие> was fairly common among the literati in the eighteenth century, but is usually frowned upon today.

Phonetic principle

The phonetic principle implies that:

• all morphemes are written as they are pronounced in isolation, without vowel reduction, Church Slavonic style, or, more strictly, taking inflexion into account (this in combination with the morphological agglutination described above is sometimes called the morphemic principle);
• certain prefixes that end in a voiced consonant (in practice, only those in -⟨з⟩ /z/) have that consonant devoiced (become [s]) to voicing assimilation. This may be reflected orthographically. For example, for the prefix/preposition без [bʲez] 'without':

• certain roots and prefixes occasionally have their vowel modified in individual cases to reflect historical changes in pronunciation, usually as a result of being unstressed or, conversely, stressed. In practice, this usually applies to -⟨o⟩- /o/ changing to -⟨a⟩- [ɐ] or [ə] (akanye), and alternations between the allophonic vowels [ɨ] and [i] (represented by ⟨ы⟩ and ⟨и⟩ respectively):

• borrowed words and foreign names are usually spelled as orthographic transcriptions, or, more precisely, mixed transcriptions-transliterations based mainly on original pronunciation (Jacques-Yves Cousteau is rendered in Russian as Жак-Ив Кусто; the English name Paul is rendered as Пол, the French name Paul as Поль, the German name Paul as Пауль) but also on original spelling (the German surnames Schmied, Schmidt, Schmitt are rendered in Russian as Шмид, Шмидт, Шмитт). In particular, double consonants are usually retained from original spelling when their pronunciation is not normally geminated. In addition, unpalatalized consonants are usually followed by ⟨е⟩ rather than ⟨э⟩ (e.g. кафе [kɐˈfɛ],'café'); 19th-century linguists, such as Yakov Karlovich Grot, considered unpalatalized pronunciation of consonants before /e/ to be foreign to Russian, though this has now become the standard for many loanwords.

Pronunciation may also deviate from normal phonological rules. For example, unstressed /o/ (spelled ⟨о⟩) is usually pronounced [ɐ] or [ə], but радио ('radio') is pronounced [ˈradʲɪo], with an unstressed final [o].

Etymological principle

The fact that Russian has retained much of its ancient phonology has made the historical or etymological principle (dominant in languages like English, French, and Irish) less relevant. Because the spelling has been adjusted to reflect the changes in the pronunciation of the yers and to eliminate letters with identical pronunciation, the only systematic examples occur in some foreign words and in some of the inflectional endings, both nominal and verbal,^{[clarification needed]} which are not always written as they are pronounced, as is the case in the adjectival and pronominal masculine/neuter genitive singular ending -ого/-его:

Grammatical principle

The grammatical principle has become stronger in contemporary Russian. It specifies conventional orthographic forms to mark grammatic distinctions (gender, participle vs. adjective, and so on). Some of these rules are ancient, and could perhaps be considered etymological; some are based in part on subtle, and not necessarily universal, distinctions in pronunciation; and some are practically arbitrary. Some characteristic examples follow.

For nouns ending in a sibilant -⟨ж⟩ /ʐ/, -⟨ш⟩ /ʂ/, -⟨щ⟩ /ɕː/, -⟨ч⟩ /t͡ɕ/, a soft sign ⟨ь⟩ is appended in the nominative singular if the gender is feminine, and is not appended if masculine:

Neither of the aforementioned consonants has phonemically distinct palatalized and unpalatalized variants. Hence, the use of ⟨ь⟩ in these examples is not to indicate a different pronunciation, but to help distinguish different grammatical genders. A common noun ending in a consonant without -⟨ь⟩ is masculine while a noun ending in -⟨ь⟩ is often feminine (though there are some masculine nouns ending in a "soft" consonant, with the -⟨ь⟩ marking a different pronunciation).

Though based on common ancient etymology, by which a hard sign ъ was appended to masculine nouns before 1918, both symbols having once been pronounced as ultra-short ("reduced") vowels (called yers in Slavic studies), the modern rule is nevertheless grammatical, because its application has been made more nearly universal.

The past passive participle has a doubled -⟨нн⟩- /nn/, while the same word used as an adjective has a single -⟨н⟩- /n/:

This rule is partly guided by pronunciation, but the geminated pronunciation is not universal. The rule is therefore considered one of the difficult points of Russian spelling, since the distinction between adjective (implying state) and participle (implying action) is not always clear. A proposal in the late 1990s to simplify this rule by basing the distinction on whether or not the verb is transitive has not been formally adopted.

Prepositional phrases in which the literal meaning is preserved are written with the words separated; when used adverbially, especially if the meaning has shifted, they are usually written as a single word:

(This is extracted from a whole set of extremely detailed rules about run-together, hyphenated, or separated components. Such rules are essentially arbitrary. There are enough sub-cases, exceptions, undecidable points, and inconsistencies that even well-educated native speakers sometimes have to check in a dictionary. Arguments about this issue have been continuous for 150 years.)

Basic symbols

The full stop (period) (.), colon (:), semicolon (;), comma (,), question mark (?), exclamation mark (!), and ellipsis (…) are equivalent in shape to the basic symbols of punctuation (знаки препинания [ˈznakʲɪ prʲɪpʲɪˈnanʲɪjə]) used for the common European languages, and follow the same general principles of usage.

The colon is used exclusively as a means of introduction, and never, as in slightly archaic English, to mark a periodic pause intermediate in strength between the semicolon and the full stop (period) (cf. H.W. Fowler, The Kingˈs English, 1908).

Comma usage

The comma is used very liberally to mark the end of introductory phases, on either side of simple appositions, and to introduce all subordinate clauses. The English distinction between restrictive and non-restrictive clauses does not exist:

Hyphenation

The hyphen (-), and em dash (—) are used to mark increasing levels of separation. The hyphen is put between components of a word, and the em-dash to separate words in a sentence, in particular to mark longer appositions or qualifications that in English would typically be put in parentheses, and as a replacement for a copula:

In short sentences describing a noun (but generally not a pronoun unless special poetic emphasis is desired) in present tense (as a substitution for a modal verb "быть/есть" (to be)):

Direct speech

Quotes are not used to mark paragraphed direct quotation, which is instead separated out by the em-dash (—):

Quotation

Inlined direct speech and other quotation is marked at the first level by guillemets «», and by lowered and raised reversed double quotes („“) at the second:

Unlike American English, the period or other terminal punctuation is placed outside the quotation. As the example above demonstrates, the quotes are often used to mark the names of entities introduced with the generic word.

Parenthetical expressions

These are introduced with the international symbol of parentheses (). However, their use is typically restricted to pure asides, rather than, as in English, to mark apposition.

Titles of works

Titles of works are marked with quotation marks:

Spelling

As in many languages, the spelling was formerly quite more phonemic and less consistent. However, the influence of the major grammarians, from Meletius Smotrytsky (1620s) to Lomonosov (1750s) to Grot (1880s), ensured a more careful application of morphology and etymology.

Today, the balance between the morphological and phonetic principles is well established. The etymological inflexions are maintained by tradition and habit, although their non-phonetic spelling has occasionally prompted controversial calls for reform (as in the periods 1900–1910, 1960–1964). A primary area where the spelling is utterly inconsistent and therefore controversial is the complexity (or even correctness) of some of the grammatical principles, especially with respect to the strung-together, hyphenated, or disjoint writing of the constituent morphemes.^{[clarification needed]}

These two points have been the topic of scientific debate since at least the middle of the nineteenth century.

In the past, uncertainty abounded about which of the ordinary or iotated/palatalizing series of vowels to allow after the sibilant consonants ⟨ж⟩ [ʐ], ⟨ш⟩ [ʂ], ⟨щ⟩ [ɕ:], ⟨ц⟩ [ts], ⟨ч⟩ [tɕ], which, as mentioned above, are not standard in their hard/soft pairs. This problem, however, appears to have been resolved by applying the phonetic and grammatical principles (and to a lesser extent, the etymological) to define a complicated though internally consistent set of spelling rules.

In 2000–2001, a minor revision of the 1956 codification was proposed. It was met with public protest and has not been formally adopted.