Webster's English Dictionary

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adaptation

ad.ap.ta.tion \.ad-.ap-'ta--sh*n\ \-shn*l, -sh*n-*l\ \-e-\ n 1a: the act or 
   process of adapting  1b: the state of being adapted  2: adjustment to 
   environmental conditions : as  2a: adjustment of a sense organ to the 
   intensity or quality of stimulation  2b: modification of an organism or its 
   parts that fits it better for the conditions of its environment 3: 
   something that is adapted; specif : a composition rewritten into  a new 
   form - ad.ap.ta.tion.al aj