declension /dɪˈklɛnʃən/

• 1. 

  N inflection of nouns, pronouns, or adjectives for case, number, and gender (名词、代词和形容词在格、数和性等方面的)词形变化

• 2. 

  N the complete set of the inflections of such a word 某个词的全部词形变化

  例：

  "puella" is a first-declension noun in Latin