In general, areas or large, open structures used for burial or entombment. Specifically, typically refers to relatively large public parks or grounds laid out expressly for the interment of the dead, and not being the yard of any church. Originally the term was derived from the Latin "cœmeterium," referring to Roman underground cemeteries or catacombs.

Source: Art and Architecture Thesaurus
http://vocab.getty.edu/page/aat/300266755