orgy

Concise Oxford English Dictionary © 2008 Oxford University Press:
orgy/ˈɔːʤi/

▶noun (pl. orgies)

• 1 a wild party characterized by excessive drinking and indiscriminate sexual activity.

• 2 a period of excessive indulgence in a specified activity: an orgy of buying.

• 3 secret rites used particularly in the worship of the Greek god Dionysus, celebrated with dancing, drunkenness, and singing.

– derivatives
orgiastic adjective,
orgiastically adverb.

– origin C16: orig. pl., from Fr. orgies, via L. from Gk orgia ‘secret rites or revels’.