Source : Webster's Revised Unabridged Dictionary (1913)

Adaptation \Ad`ap*ta"tion\, n. [Cf. F. adaptation, LL.
   adaptatio.]
   1. The act or process of adapting, or fitting; or the state
      of being adapted or fitted; fitness. ``Adaptation of the
      means to the end.'' --Erskine.

   2. The result of adapting; an adapted form.

Source : WordNet®

adaptation
     n 1: a written work (as a novel) that has been recast in a new
          form; "the play is an adaptation of a short novel" [syn:
           {version}]
     2: the process of adapting to something (such as environmental
        conditions) [syn: {adjustment}]
     3: (physiology) the responsive adjustment of a sense organ (as
        the eye) to varying conditions (as of light)