What is the meaning of Inflection?

The linguistic phenomenon of morphological variation, whereby terms take a number of distinct forms in order to express different grammatical features.

Any specific type of morphological variation, which applies to a given class of terms.

An affix representing a given variation.

Any specific morphological form of a particular term, such as the principal parts for any given stem; any of the declined or conjugated forms that constitute its declension or conjugation.

A change in pitch or tone of voice.

A change in curvature from concave to convex or from convex to concave.

A turning away from a straight course.

Diffraction.

Source: wiktionary.org