adaptation in WordNet English dictionary

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