affine

(mathematics) Assigning finite values to finite quantities.

(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.

(comparable, chemistry) Of two materials, having mutual affinity.