Source : Webster's Revised Unabridged Dictionary (1913)

Encasement \En*case"ment\, n. [Cf. {Casement}.]
   1. The act of encasing; also, that which encases.

   2. (Biol.) An old theory of generation similar to
      embo[^i]tement. See {Ovulist}.

Source : WordNet®

encasement
     n : the act of enclosing something in a case [syn: {incasement}]