declension

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declension

grammar

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June 25, 2026

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In grammar, declension refers to the inflection of nouns, adjectives, and pronouns, indicating their grammatical case, number, and gender. This system of word forms, or inflections, is prescribed in an ordered way. A class of nouns or adjectives that share the same inflectional patterns is also called a declension.1

While many languages, like Latin and Greek, have extensive case systems, some Indigenous North American languages, for example, do not typically use cases in the same way. However, some languages do have case systems, and others use prefixes or suffixes to indicate possession or grammatical relationships. The term "declensional" pertains to this grammatical concept of declension. The word "declension" itself entered English in the 15th century, derived from Latin, initially referring to grammatical inflection before evolving to also mean deterioration or descent.231

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Greek language
Morphology
…the vocative case, the Greek declension in the Mycenaean period still contained five cases: nominative, accusative, genitive, dative-locative, and instrumental. Between the Mycenaean period and the 8th century the instrumental ceased to exist as a distinct case, its role having been taken over by the dative.
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…the vocative case, the Greek declension in the Mycenaean period still contained five cases: nominative, accusative, genitive, dative-locative, and instrumental. Between the Mycenaean period and the 8th century the instrumental ceased to exist as a distinct case, its role having been taken over by the dative.
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Latin language
…lost, and a fifth noun declension was developed from a heterogeneous collection of nouns. Probably before the Romance period the number of cases was further reduced (there were two in Old French—nominative, used for the subject of a verb, and oblique, used for all other functions—and Romanian today has two,…
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…lost, and a fifth noun declension was developed from a heterogeneous collection of nouns. Probably before the Romance period the number of cases was further reduced (there were two in Old French—nominative, used for the subject of a verb, and oblique, used for all other functions—and Romanian today has two,…
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Etruscan language
Grammatical characteristics
…in the inscriptions, the noun declension system can be understood reasonably well. Similar to the process of word building is the construction called genitivus genitivi, or “genitive of the genitive,” in which several possessive suffixes may be added to a word in succession. Thus, the simple genitive of larth, a…
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…in the inscriptions, the noun declension system can be understood reasonably well. Similar to the process of word building is the construction called genitivus genitivi, or “genitive of the genitive,” in which several possessive suffixes may be added to a word in succession. Thus, the simple genitive of larth, a…
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Germanic languages
Declensions
Proto-Germanic kept the Proto-Indo-European system of three genders (masculine, feminine, neuter) and three numbers (singular, dual, plural), though the dual was becoming obsolete. It reduced the Proto-Indo-European system of eight cases to six: nominative, accusative, dative, genitive, instrumental, and vocative, though the last two…
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Proto-Germanic kept the Proto-Indo-European system of three genders (masculine, feminine, neuter) and three numbers (singular, dual, plural), though the dual was becoming obsolete. It reduced the Proto-Indo-European system of eight cases to six: nominative, accusative, dative, genitive, instrumental, and vocative, though the last two…
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