Source : WordNet®

affine transformation
     n : (mathematics) a transformation that is a combination of
         single transformations such as translation or rotation or
         reflection on an axis

Source : Free On-Line Dictionary of Computing

affine transformation
     
         A {linear transformation} followed by a
        {translation}.  Given a {matrix} M and a {vector} v,
     
          A(x) = Mx + v
     
        is a typical affine transformation.
     
        (1995-04-10)