Declension

Declension is the variation of nouns, pronouns, and adjectives to mark grammatical features such as case, number, and gender, or the resulting pattern of forms.

Number (grammar): The grammatical distinction between quantities such as singular and plural. Declined forms often distinguish singular from plural.
Morphology (linguistics): The study of the internal structure and formation of words. Declension is a pattern within the broader study of word forms.
Latin grammar: The grammatical system of Latin, including its case-marked nouns and agreeing adjectives. Latin presents a widely taught system of nominal and adjectival declensions.
Conjugation: The inflection of verbs to express features such as tense, mood, person, and number. Conjugation inflects verbs, whereas declension typically applies to nominals.
Grammatical gender: A grammatical system that groups nouns and can shape agreement on related words. Gender can determine which adjective or pronoun forms accompany a noun.
Morpheme: The smallest linguistic unit that carries meaning or grammatical function. Declensional endings can be grammatical morphemes.
Ancient Greek grammar: The grammatical system of Ancient Greek, including inflected nouns, pronouns, and adjectives. Its noun patterns illustrate declension across cases and numbers.
Analytic language: A language that relies relatively heavily on word order and separate particles rather than inflection. Analytic strategies can express distinctions that a language might otherwise mark through declension.
Inflection: A change in a word’s form that expresses grammatical information. Declension is nominal inflection, alongside other kinds of inflection.
Stem (linguistics): The part of a word to which inflectional material may be added. Many declension patterns combine a stem with changing endings.

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Grammatical conjugationCompared with: Declension inflects nominal words, while conjugation inflects verbs.