orgy

[awr-jee] /ˈɔr dʒi/
noun, plural orgies.
1.
wild, drunken or licentious festivity or revelry.
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.
Origin
1580-90; < Middle French orgie < Latin orgia (neuter plural) secret rites < Greek órgia, akin to érgon work
British Dictionary definitions for orgy

orgy

/ˈɔːdʒɪ/
noun (pl) -gies
1.
a wild gathering marked by promiscuous sexual activity, excessive drinking, etc
2.
an act of immoderate or frenzied indulgence
3.
(often pl) secret religious rites of Dionysus, Bacchus, etc, marked by drinking, dancing, and songs
Derived Forms
orgiastic, adjective
Word Origin
C16: from French orgies, from Latin orgia, from Greek: nocturnal festival
Word Origin and History for orgy
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.