Meaning

noun a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function

noun the patterns of stress and intonation in a language

noun deviation from a straight or normal course

originFrom older inflexion, borrowed from Middle French inflexion, itself borrowed from Latin inflexiōnem (“alteration”, literally “bending”). The English spelling with ⟨ct⟩ is due to influence from inflect or related words like correction.

Etymology from Wiktionary, CC BY-SA 3.0