"declension" in the noun sense
the inflection of nouns and pronouns and adjectives in Indo-European languages
2. deterioration, decline in quality, declension, worsening
process of changing to an inferior state
3. descent, declivity, fall, decline, declination, declension, downslope
a downward slope or bend
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"
Source: WordNet® (An amazing lexical database of English)
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