adj

• (not comparable, mathematics) Assigning finite values to finite quantities.
• (not comparable, geometry) Of or pertaining to a function expressible as f(⃑x)=A⃑x+⃑b (where A is a linear transformation and ⃑b is a constant), which, regarded as a transformation, maps parallel lines to parallel lines and finite points to finite points.
  "Now, let P, Q, and R be three noncollinear points that are left fixed by an affine transformation T."
• (comparable, chemistry) Of two materials, having mutual affinity.

noun

• (anthropology, genealogy) A relative by marriage.
  "1970 [Routledge and Kegan Paul], Raymond Firth, Jane Hubert, Anthony Forge, Families and Their Relatives: Kinship in a Middle-Class Sector of London, 2006, Taylor & Francis (Routledge), page 135, The element of personal idiosyncracy may be expected to be most marked in regard to affines (i.e. those related by marriage) and particularly with the consanguines of affines, who are linked by still more tenuous bonds. There are many possible degrees of affinal relationship here, but broadly affines separate into two main types: spouse of consanguine of Ego, and consanguine of spouse of Ego—exemplified by my brother's wife, and my wife's brother."

verb

• (transitive) To refine.
  "The next stage is remelting: the affined sugar is dissolved in hot water and the syrup formed is made alkaline by adding milk of lime."
• (computing, transitive) To set the CPU affinity of something
  "affined the sequential regions to run only on CPU 0"