noun (n)

• a written work (as a novel) that has been recast in a new form(noun.communication)

  Example:
  The play is an adaptation of a short novel.
  

  Synonym:
  version
  

  source: wordnet30
• the process of adapting to something (such as environmental conditions)(noun.process)

  Synonym:
  adaption, adjustment
  

  source: wordnet30
• (physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light)(noun.act)

  source: wordnet30
• The act or process of adapting, or fitting; or the state of being adapted or fitted; fitness.(noun)

  source: webster1913