Source : Webster's Revised Unabridged Dictionary (1913)

Entombment \En*tomb"ment\, n.
   The act of entombing or burying, or state of being entombed;
   burial. --Barrow.

Source : WordNet®

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