inflection

In grammatical analysis, an ending or other element in a word that indicates its grammatical function in a sentence. (whether it is plural or singular, masculine or feminine, subject or object, and so on).

In a highly inflected language like Latin, nouns, verbs, and adjectives have many inflectional endings (for example, in the word amabunt the base am means ‘love’ and the complex abunt indicates the kind of verb, the future tense, indicative mood, active voice, third person, and plurality). English has few inflections: for example, the s for plural forms (as in the books) and for the third person singular of verbs (as in He runs).

inflection

In mathematics, point on a curve where the curve changes from being convex to concave or vice versa. For differentiable functions the second derivative is zero at such a point.