Wordnet 3.0
NOUN (1)
1. 
 (anthropology) kin by marriage; 
ADJECTIVE (2)
1. 
 (mathematics) of or pertaining to the geometry of affine transformations; 
2. 
 (anthropology) related by marriage; 
[syn: affinal, affine]
The Collaborative International Dictionary of English v.0.48:
Affine \Af*fine"\, v. t. [F. affiner to refine; ? (L. ad) + fin
   fine. See Fine.]
   To refine. [Obs.] --Holland.
   [1913 Webster]
WordNet (r) 3.0 (2006):
affine
    adj 1: (mathematics) of or pertaining to the geometry of affine
           transformations
    2: (anthropology) related by marriage [syn: affinal, affine]
    n 1: (anthropology) kin by marriage