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In grammar, inflection or inflexion is the modification of a word to express different grammatical categories such as tense, mood, voice, aspect, person, number, gender and case. Conjugation is the inflection of verbs; declension is the inflection of nouns, adjectives and pronouns.

Inflection can be overt or covert within the same language. An overt inflection expresses grammatical category with an explicitly stated affix. Latin ducam, "I will lead", includes an explicit affix, -am, expressing person (first), number (singular) and future tense. This is an overt inflection. In the English, the "lead" is not marked for either person or number and is marked for tense, but only in opposition to "led"; that is, not specifically for the future. The whole clause, however, achieves all the specific grammatical categories by use of other words. This is covert inflection, or periphrasis. The process typically distinguishes lexical items (such as lexemes) from functional ones (such as affixes, clitics, particles and morphemes in general) and has functional items acting as markers on lexical ones.

Lexical items that do not respond to overt inflection are invariant or uninflected; for example, "will" is an invariant item: it never takes an affix or changes form to signify a different grammatical category. Its category can only be determined by its context. Uninflected words do not need to be lemmatized in linguistic descriptions or in language computing. On the other hand, inflectional paradigms, or lists of inflected forms of typical words (such as sing, sang, sung, sings, singing, singer, singers, song, songs, songstress, songstresses in English) need to be analyzed according to criteria for uncovering the underlying lexical stem (here s*ng-); that is, the accompanying functional items (-i-, -a-, -u-, -s, -ing, -er, -o-, -stress, -es) and the functional categories of which they are markers need to be distinguished to adequately describe the language.

Constraining the cross-referencing of inflection in a sentence is known as concord or agreement. For example, in "the choir sings", "choir" and "sings" are constrained to the singular number; if one is singular, they both must be.

Languages that have some degree of overt inflection are inflected languages. The latter can be highly inflected, such as Latin, or weakly inflected, such as English, depending on the degree of overt inflection.

Examples in English

In English many nouns are inflected for number with the inflectional plural affix -s (as in "dog" → "dog-s"), and most English verbs are inflected for tense with the inflectional past tense affix -ed (as in "call" → "call-ed"). English also inflects verbs by affixation to mark the third person singular in the present tense (with -s), and the present participle (with -ing). English short adjectives are inflected to mark comparative and superlative forms (with -er and -est respectively). In addition, English also shows inflection by ablaut (mostly in verbs) and umlaut (mostly in nouns), as well as long-short vowel alternation. For example:

  • Write, wrote, written (marking by ablaut variation, and also suffixing in the participle)
  • Sing, sang, sung (ablaut)
  • Foot, feet (marking by umlaut variation)
  • Mouse, mice (umlaut)
  • Child, children (ablaut, and also suffixing in the plural)

Declension and conjugation

Two traditional grammatical terms refer to inflections of specific word classes:

An organized list of the inflected forms of a given lexeme is also called its declension, or conjugation, as the case may be.

Below is the declension of the English pronoun I, which is inflected for case and number.

singular plural
subjective I we
objective me us
possessive my, mine our, ours
reflexive myself ourselves

The pronoun who is also inflected in formal English according to case. Its declension is defective, in the sense that it lacks a reflexive form.

singular & plural
subjective who
objective whom
possessive whose
reflexive -

The following table shows the conjugation of the verb to arrive in the indicative mood. It is inflected for person, number, and tense by suffixation.

Tense I you he, she, it we you they
Present arrive arrive arrives arrive arrive arrive
Past arrived arrived arrived arrived arrived arrived

The non-finite form arriv'e (bare infinitive), arriv'ed (past participle) and arriv'ing (gerund/present participle), although not inflected for person or number, can also be regarded as part of the conjugation of the verb to arrive. Compound verb form such as I have arrived, I had arrived, or I will arrive can be included also in the conjugation of this verb for didactical purposes, but are not overt conjugations of arrive. The formula for deriving the covert form is

pronoun + conjugated auxiliary verb + non-finite form of main verb.

A class of words with similar inflection rules is called an inflectional paradigm. Typically the similar rules amount to a unique set of affixes. Nominal inflectional paradigms are also called declensions, and verbal inflectional paradigms are also called conjugations. For example, in Old English nouns could be divided into two major declensions, the strong and the weak, inflected as is shown below:

gender and number
Masculine Neuter Feminine
Singular Plural Singular Plural Singular Plural
case Strong Noun Declension
engel 'angel' scip 'ship' sorg 'sorrow'
Nominative engel englas scip scipu sorg sorga
Accusative engel englas scip scipu sorge sorga/sorge
Genitive engles engla scipes scipa sorge sorga
Dative engle englum scipe scipum sorge sorgum
case Weak Noun Declension
nama 'name' ēage 'eye' tunge 'tongue'
Nominative nama naman ēage ēagan tunge tungan
Accusative naman naman ēage ēagan tungan tungan
Genitive naman namena ēagan ēagena tungan tungena
Dative naman namum ēagan ēagum tungan tungum

These two terms, however, seem to be biased toward well-known dependent-marking languages (such as the Indo-European languages, or Japanese). In dependent-marking languages, nouns in adpositional phrases can carry inflectional morphemes. (Adpositions include prepositions and postpositions.) In head-marking languages, the adpositions can carry the inflection in adpositional phrases. This means that these languages will have inflected adpositions. In Western Apache (San Carlosmarker dialect), the postposition -ká’ 'on' is inflected for person and number with prefixes.

Singular Dual Plural
1st shi- on me noh- on us two da-noh- 'on us'
2nd ni- on you nohwi- 'on you two' da-nohwi- 'on you all'
3rd bi- 'on him' - da-bi- 'on them'

Traditional grammars have specific terms for inflections of nouns and verbs, but not for those of adpositions.

Inflection vs. derivation

Inflection is the process of adding inflectional morphemes (smallest units of meaning) to a word, which indicate grammatical information (for example, case, number, person, gender or word class, mood, tense, or aspect). Derivation is the process of adding derivational morphemes, which create a new word from existing words, sometimes by simply changing grammatical category (for example, changing a noun to a

Words generally are not listed in dictionaries (in which case they would be lexical items) on the basis of their inflectional morphemes. But they often are listed on the basis of their derivational morphemes. For instance, English dictionaries list readable and readability, words with derivational suffixes, along with their root read. However, no traditional English dictionary lists book as one entry and books as a separate entry nor do they list jump and jumped as two different entries.

Inflectional morphology

Languages that add inflectional morphemes to words are sometimes called inflectional languages, which is a synonym for inflected languages. Morphemes may be added in several different ways:

Affixing includes prefixing (adding before the base), and suffixing (adding after the base), as well as the much less common infixing (inside) and circumfixing (a combination of prefix and suffix).

Inflection is most typically realized by adding an inflectional morpheme (that is, affixation) to the base form (either the root or a stem).

Inflection in various languages

Indo-European languages (fusional)

All Indo-European languages, such as Albanian, English, German, Russian, Persian , Kurdish , Italian, Spanish, French, Sanskrit, Bengali and Hindi are inflected to a greater or lesser extent. In general, older Indo-European languages such as Latin, Ancient Greek, Old English, Old Norse, and Sanskrit are extensively inflected. Deflexion has caused modern versions of some languages that were previously highly inflected to be much less so; an excellent example is Modern English, as compared to Old English.


Old English was a moderately inflected language, using an extensive case system similar to that of modern Icelandic or German. Middle and Modern English lost progressively more of the Old English inflectional system. Modern English is considered a weakly inflected language, since its nouns have only vestiges of inflection (plurals, the pronouns), and its regular verbs have only four forms: an inflected form for the past indicative and subjunctive (looked), an inflected form for the third-person-singular present indicative (looks), an inflected form for the present participle (looking), and an uninflected form for everything else (look). While the English possessive indicator 's (as in "Jane's book") is a remnant of the Old English genitive case suffix, it is now considered not a suffix but a clitic.

Other Germanic languages

Old Norse was inflected, but modern Swedish, Norwegian and Danish have, like English, lost almost all overt inflection. Icelandic preserves almost all of the inflections of Old Norse and has added its own. Modern German remains moderately inflected, retaining four noun cases, although the genitive started falling into disuse in all but formal writing in Early New High German. The case system of Dutch, simpler than German's, is also becoming more simplified in common usage. Afrikaans, recognized as a distinct language in its own right rather than a Dutch dialect only in the early 20th century, has lost almost all inflection.

Latin and the Romance languages

The Romance languages, such as Spanish, Italian, French, Portuguese and Romanian, have more overt inflection than English, especially in verb conjugation. Adjectives, nouns and articles are considerably less inflected, but they still have different forms according to number and grammatical gender.

Latin, the mother tongue of the Romance languages, was highly inflected; nouns and adjectives had different forms according to five major grammatical cases (seven in all) with five major patterns of declension, and three genders instead of the two found in most Romance tongues. There were four patterns of conjugation in 6 tenses, two moods and two voices, all overtly expressed by affixes (passive voice forms were periphrastic in three tenses).

Baltic languages

The Baltic languages are moderately inflected. Nouns and adjectives are declined in up to seven overt cases. Additional cases are defined in various covert ways. For example, an inessive case, an illative case, an adessive case and allative case are borrowed from Finnic. Latvian has only one overt locative case but it syncretizes the above four cases to the locative marking them by differences in the use of prepositions. Lithuanian breaks them out of the genitive case, accusative case and locative case by using different postpositions.

Modern Baltic languages have also retained the old dual number. However, it is nowadays considered obsolete. For instance, in standard Lithuanian it is normal to say "dvi varnos (pl.) - two crows" instead of "dvi varni (du.)". Adjectives, pronouns, and numerals are declined for number, gender, and case to agree with the noun they modify or for which they substitute. Baltic verbs are inflected for tense, mood, aspect, and voice. They agree with the subject in person and number (not in all forms in modern Latvian).

Slavic languages

The Slavic languages, including Russian, Polish, Macedonian, Czech, Slovak, Serbian, Croatian, Bosnian, Ukrainian, Bulgarian, and Slovene among others, all make use of a high degree of inflection, typically having six or seven cases and three genders—like Greek (however, the overt case system has disappeared almost completely in modern Bulgarian and Macedonian, except for the vocative).

Declensional endings depend on case (nominative, genitive, dative, accusative, locative, instrumental, vocative), number (singular, dual or plural), gender (masculine, feminine, neuter) and animacy (animate vs inanimate). Unusual in other language families, declension in most Slavic languages also depends on whether the word is a noun or an adjective. Slovene and Sorbian languages use a rare third number, (in addition to singular and plural numbers) known as dual. In addition, in some Slavic languages, such as Polish, word stems are frequently modified by the addition or absence of endings, resulting in consonant and vowel alternation.

Arabic (fusional)

Arabic ( , "Al-Luġah al-‘Arabiyyah al-Fuṣḥā"), or more precisely "Modern Standard Arabic" (also called "Literary Arabic"), is a highly-inflected language. It uses a complex system of pronouns and their respective prefixes and suffixes for verb, noun, adjective and possessive conjugation. In addition, the system known as al-‘Irāb places vowel suffixes on each verb, noun, adjective, and adverb, according to its function within a sentence and its relation to surrounding words.

The following table is an example of present-tense case applications in Arabic:
Base Singular Plural Dual
Pronoun Possessive Suffix Verb Affixes Pronoun Possess. Suffix Verb Affixes Pronoun Possess. Suffix Verb Affixes
I - - -
you (masc.)
you (fem.) " " "
she " " "

Arabic regional dialects (e.g. Moroccanmarker Arabic, Egyptianmarker Arabic, Gulfmarker Arabic), used for everyday communication, tend to have less inflection than the more formal Literary Arabic. For example, in Jordanianmarker Arabic, the second- and third-person feminine plurals ( /antunna/ and /hunna/) and their respective unique conjugations are lost and replaced by the masculine ( /antum/ and /hum/).

Uralic languages (agglutinative)

The Uralic languages (comprising Finno-Ugric and Samoyedic) are agglutinative, following from the agglutination in Proto-Uralic. The largest languages are Hungarian, Finnish, and Estonian—all European Union official languages. Uralic inflection is, or is developed from, affixing. Grammatical markers directly added to the word perform the same function as prepositions in English. Almost all words are inflected according to their roles in the sentence: verbs, nouns, pronouns, numerals, adjectives, and some particles.

Hungarian and Finnish, in particular, often simply concatenate suffixes. For example, Finnish talossanikinko "in my house, too?" consists of talo-ssa-ni-kin-ko. However, in the Finnic languages (Finnish, Estonian, Sami), there are processes which affect the root, particularly consonant gradation. The original suffixes may disappear (and appear only by liaison), leaving behind the modification of the root. This process is extensively developed in Estonian and Sami, and makes them also inflected, not only agglutinating languages. The Estonian accusative case, for example, is expressed by a modified root: majamajja (historical form *majam).

Basque (agglutinative)

Basque, a language isolate, is an extremely inflected language, heavily inflecting both nouns and verbs. A Basque noun is inflected in 17 different ways for case, multiplied by 4 ways for its definiteness and number. These first 68 forms are further modified based on other parts of the sentence, which in turn are inflected for the noun again. It is estimated that at two levels of recursion, a Basque noun may have 458,683 inflected forms. Verb forms are similarly complex, agreeing with the subject, the direct object and several other argument.

East Asian languages (isolating)

Some of the major Eastern Asian languages (such as the various Chinese languages, Vietnamese, and Thai) are not overtly inflected, or show very little overt inflection, so they are considered analytic languages (also known as isolating languages).


Japanese shows a high degree of overt inflection of verbs, less so of adjectives, and very little of nouns, but it is always strictly agglutinative and extremely regular. Formally, every noun phrase must be marked for case, but this is done by invariable particles (clitic postpositions). (Many grammarians consider Japanese particles to be separate words, and therefore not an inflection, while others consider agglutination a type of overt inflection, and therefore consider Japanese nouns as overtly inflected.)


The Chinese family of languages, in general, does not possess overt inflectional morphology. Chinese terms generally comprise of one or two monosyllabic words, each of which corresponds to a written character and individual morpheme. Since morphemes are monosyllabic in the Chinese languages, Chinese is quite resistant to inflectional changes; instead, Chinese uses lexical means for achieving covert inflectional transparency.

While European languages more often use overt inflection to mark a word's function in a sentence, the Chinese languages tend to use word order as a grammatical marking system. Whereas in English the first-person singular nominative "I" changes to "me" when used in the accusative - that is, when "I" is the object of a verb - Chinese simply uses word order to mark such a distinction. An example from Mandarin: 我给了他一本书 (wǒ gěile tā yī běn shū) 'I gave him a book'. Here 我 () means 'I' and 他 () means 'him'. However, 'He gave me a book' would be: 他给了我一本书 (tā gěile wǒ yī běn shū). 我 () and 他 () simply change places in the sentence to indicate that their case has switched: there is no overt inflection in the form of the words. In classical Chinese, pronouns were overtly inflected as to case. However, these overt case forms are no longer used; most of the alternative pronouns are considered archaic in modern Mandarin Chinese. Classically, 我 () was used solely as the first person accusative. 吾 () was generally used as the first person nominative.

Auxiliary languages

Auxiliary languages, such as Esperanto, Ido, and Interlingua have comparatively simple inflectional systems.


In Esperanto, nouns and adjectives are inflected for case (nominative, accusative) and number (singular, plural), according to a simple paradigm without irregularities. Verbs are not inflected for person or number, but they are inflected for tense (past, present, future) and mood (indicative, infinitive, conditional, jussive). They also form active and passive participles, which may be past, present or future. All verbs are regular.


Ido has a different form for each verbal tense (past, present, future, volitive and imperative) plus an infinitive, and both a present and past participle. There are though no inflections for person or number and all verbs are regular.

Nouns are marked for number (singular and plural), and the accusative case may be shown in certain situations, typically when the direct object of a sentence precedes its verb. On the other hand, adjectives are unmarked for gender, number or case (unless they stand on their own, without a noun, in which case they take on the same desinences as the missing noun would have taken). The definite article "la" ("the") remains unaltered regardless of gender or case, and also of number, except when there is no other word to show plurality. Pronouns are identical in all cases, though exceptionally the accusative case may be marked, as for nouns.


Interlingua, in contrast with the Romance languages, has no irregular verb conjugations, and its verb forms are the same for all persons and numbers. It does, however, have compound verb tenses similar to those in the Romance, Germanic, and Slavic languages: ille ha vivite, "he has lived"; illa habeva vivite, "she had lived". Nouns are inflected by number, taking a plural -s, but rarely by gender: only when referring to a male or female being. Interlingua has no noun-adjective agreement by gender, number, or case. As a result, adjectives ordinarily have no inflections. They may take the plural form if they are being used in place of a noun: le povres, "the poor".


References and recommended reading

See also

External links

SIL articles

Lexicon of Linguistics articles

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