What is "cenogamy"

Coenogamy \C[oe]*nog"a*my\, n. [Gr. ?; koino`s common + ? marraige.] The state of a community which permits promiscuous sexual intercourse among its members; -- as in certain primitive tribes or communistic societies. [Written also cenogamy.]

n. The state of a community which permits promiscuous sexual intercourse among its members, as in certain societies practicing communism.