the.com/declension
How languages make nouns do push-ups depending on their job in the sentence.
means The way a noun, pronoun, or adjective changes its ending depending on whether it's the subject, object, possessor, or other grammatical role in a sentence.
from From Latin declinatio, 'a bending aside' or 'turning away,' from declinare (de- 'away' + clinare 'to bend/lean'). Roman grammarians borrowed this bending imagery to describe how a word's base form 'leans away' into its various case forms — the nominative standing upright, everything else tilting off from it. The same root gave English 'decline' and 'incline,' all sharing that core idea of leaning in a direction.
- not conjugation
- that is verbs, this is nouns, pronouns, adjectives
- latin flex
- five declensions, each with its own ending drama
- english mostly skipped it
- except pronouns, he vs him vs his still survives
- case system
- nominative, genitive, dative, accusative all change the word's suit