Source : Webster's Revised Unabridged Dictionary (1913)

Apery \Ap"er*y\, n.; pl. {Aperies}.
   1. A place where apes are kept. [R.] --Kingsley.

   2. The practice of aping; an apish action. --Coleridge.

Source : WordNet®

apery
     n : the act of mimicking; imitative behavior [syn: {mimicry}]