The Collaborative International Dictionary of English v.0.48:

Interment \In*ter"ment\, n. [OE. enterment, F. enterrement. See
   Inter, v. t.]
   The act or ceremony of depositing a dead body in the earth;
   burial; sepulture; inhumation. --T. Warton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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