Definitions for "Affine transformation"
Transformation between any two Euclidean spaces -- consists of a combination of translation, rotation, and scaling.
Linear transformation (multiplication by a 2 x 2 matrix) followed by a translation (addition of a 1 x 2 matrix).
a transformation (usually in a plane) which takes parallel lines to parallel lines (lengths and angles may change); includes enlargement and reductions, shearing and stretching.