orgy

noun, plural or·gies.

1. wild or drunken festivity or revelry, especially involving sex with multiple participants.
2. any actions or proceedings marked by unbridled indulgence of passions: an orgy of killing.
3. orgies, (in ancient Greece) esoteric religious rituals, especially in the worship of Demeter or Dionysus, characterized in later times by wild dancing, singing, and drinking.
4. Informal. a boisterous, rowdy party.

noun plural -gies

1. a wild gathering marked by promiscuous sexual activity, excessive drinking, etc
2. an act of immoderate or frenzied indulgence
3. (often plural) secret religious rites of Dionysus, Bacchus, etc, marked by drinking, dancing, and songs

n.1560s, orgies (plural) “secret rites in the worship of certain Greek and Roman gods,” especially Dionysus, from Middle French orgies (c.1500, from Latin orgia), and directly from Greek orgia (plural) “secret rites,” especially those of Bacchus, from PIE root *werg- “to work” (see urge (v.)). The singular, orgy, was first used in English 1660s for the extended sense of “any licentious revelry.” OED says of the ancient rites that they were “celebrated with extravagant dancing, singing, drinking, etc.,” which gives “etc.” quite a workout.