orgy

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A revel involving unrestrained indulgence, especially sexual activity.
2. n. Uncontrolled or immoderate indulgence in an activity: an orgy of spending. See Synonyms at binge.
3. n. A secret rite in the cults of ancient Greek or Roman deities, typically involving frenzied singing, dancing, drinking, and sexual activity.

Century Dictionary and Cyclopedia

1. n. Secret rites or ceremonies connected with the worship of some of the deities of classical mythology, as the mysteries of Ceres; particularly, the revels at the festivals in honor of Dionysus or Bacchus, or the festival itself, which was celebrated with boisterous songs and dancing (see bacchante and mœmad): generally plural in this sense.
2. n. Hence A wild or frantic revel; a nocturnal carousal; drunken revelry.
3. n. Synonyms Revel, Debauch, etc. See carousal.

Wiktionary

1. n. A revel involving indiscriminate group sexual activity.
2. n. Excessive indulgence in a specified activity.

GNU Webster's 1913

1. n. A sacrifice accompanied by certain ceremonies in honor of some pagan deity; especially, the ceremonies observed by the Greeks and Romans in the worship of Dionysus, or Bacchus, which were characterized by wild and dissolute revelry. Usually in the plural form.
2. n. Wild, drunken, or licentious revelry; an uninhibited carouse.
3. n. A series of sexual activities involving more than two couples in a group.
4. n. An event characterized by unrestrained indulgence in passion.
5. n. A frantic revel; drunken revelry. See orgies

WordNet 3.0

1. n. a wild gathering involving excessive drinking and promiscuity
2. n. any act of immoderate indulgence
3. n. secret rite in the cults of ancient Greek or Roman deities involving singing and dancing and drinking and sexual activity