cemetery (n.) Look up cemetery at Dictionary.com
"graveyard, burial place," late 14c., from Old French cimetiere "graveyard" (12c.), from Late Latin coemeterium, from Greek koimeterion "sleeping place, dormitory," from koiman "to put to sleep," keimai "I lie down." This is from PIE root *kei- "to lie, rest," also "bed, couch," hence secondary sense of "beloved, dear" (source also of Greek keisthai "to lie, lie asleep," Old Church Slavonic semija "family, domestic servants," Lithuanian šeima "domestic servants," Lettish sieva "wife," Old English hiwan "members of a household," higid "measure of land," Latin cunae "a cradle," Sanskrit Sivah "propitious, gracious").

Early Christian writers were the first to use it for "burial ground," though the Greek word also had been anciently used in reference to the sleep of death. In Middle English simeterie, cymytory, cimitere, etc.; forms with cem- are from late 15c. An Old English word for "cemetery" was licburg (see lich (n.)).