affine uh fahyn n (anthropology) kin by marriage a (mathematics) of or pertaining to the geometry of affine transformations s (anthropology) related by marriage Usage(s) Roughly speaking, "non-affine" space is undistorted space. Schrdinger has found this in an "affine" geometry, which deals with pure concepts in their essence, not with measurement in the ordinary sense. Synonym(s) affinal