a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms; "the first declension in Latin" 同じ（または非常に類似的な）屈曲形があるインドヨーロッパ語族の名詞、代名詞、形容詞の種類。
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【下位】 a noticeable deterioration in performance or quality; "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality" 性能または品質の顕著な悪化。
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【上位】 a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function 文法的な機能の変化を示すために（通常は接尾辞を加えて）単語の形を変化させたもの。
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