orgy

Etymology

Originally in plural from French orgies, from Latin orgia, from Ancient Greek ὄργια (órgia, “secret rites, mysteries”).

noun

1. Originally, secret rites or ceremonies, typically involving riotous and dissolute behaviour, including dancing, drunkenness and indiscriminate sexual activity, undertaken in honour of various pagan gods or goddesses (such as Attis, Bacchus, Ceres, Dionysus, Osiris, etc). [from 16th c.]
   Human sacrifices of a definitely black magical order took place at the tomb of Osiris, while similar orgies with human victims were performed at Heliopolis. 1936, Rollo Ahmed, The Black Art, London: Long, page 39
2. A gathering of people to engage in group sex.
3. Excessive indulgence in a specified activity.
   Gorea 07: 'OUR DEFENSES WERE USELESS AGAINST GOREA AS IT SWEPT THROUGH OUR EMPIRE IN AN ORGY OF ANNIHILATION.' 2006 March 20, Nintendo Software Technology, Metroid Prime Hunters, Nintendo, Nintendo DS, Logbook – Lore