Definition of "declension" in English

noun

1. A falling off, decay or descent.

2. (grammar) The act of declining a word; the act of listing the inflections of a noun, pronoun or adjective in order.

3. (grammar) The product of that act; a list of declined forms.

   • a page full of declensions

4. (grammar) A way of categorizing nouns, pronouns, or adjectives according to the inflections they receive.

   • In Latin, 'amicus' belongs to the second declension. Most second-declension nouns end in '-i' in the genitive singular and '-um' in the accusative singular.