The Collaborative International Dictionary of English v.0.48:

Inhumation \In`hu*ma"tion\, n. [Cf. F. inhumation.]
   [1913 Webster]
   1. The act of inhuming or burying; interment.
      [1913 Webster]

   2. (Old Chem.) The act of burying vessels in warm earth in
      order to expose their contents to a steady moderate heat;
      the state of being thus exposed.
      [1913 Webster]

   3. (Med.) Arenation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

inhumation
    n 1: the ritual placing of a corpse in a grave [syn: burial,
         entombment, inhumation, interment, sepulture]