Definition of "inflection"

(grammar, uncountable) Change in the form of a word (morphologic change) to express different grammatical categories.  examples

(grammar, countable) An instance of such change.

1. (grammar) An affix representing such an instance.  examples

(grammar, countable) Any form produced by such an instance of a change, such as the principal parts for any given stem: any of the declined or conjugated forms that constitute its declension or conjugation.  examples

A change in pitch or tone of voice.  examples

(mathematics) A change in curvature from concave to convex or from convex to concave.  examples

A turning away from a straight course.  examples

(optometry) Diffraction.  examples