The Collaborative International Dictionary of English v.0.48:
Entombment \En*tomb"ment\, n. The act of entombing or burying, or state of being entombed; burial. --Barrow. [1913 Webster]WordNet (r) 3.0 (2006):
entombment n 1: the ritual placing of a corpse in a grave [syn: burial, entombment, inhumation, interment, sepulture]