declension
de-clen-sion
noun
A state of decline or deterioration, often moral or societal.
"The empire was in a state of declension."
noun
The inflection of nouns, pronouns, and adjectives to show grammatical features.
"Latin has several complex declensions."
Thesaurus
Synonyms: decline in quality, deterioration, worsening, declination, downslope, fall, decline, declivity, descent