/ Dictionary / Index A affine: Meaning and Definition of Find definitions for: af•fine Pronunciation: (a-fīn', u-fīn', af'īn), [key] — n. a person related to one by marriage. —adj. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: affine (Thesaurus) affinal affined Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language