The Collaborative International Dictionary of English v.0.48:

Graveyard \Grave"yard"\, n.
   A yard or inclosure for the interment of the dead; a
   cemetery.
   [1913 Webster]

WordNet (r) 3.0 (2006):

graveyard
    n 1: a tract of land used for burials [syn: cemetery,
         graveyard, burial site, burial ground, burying
         ground, memorial park, necropolis]