Definitions
1.nounOriginally, 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).
2.nounA gathering of people to engage in group sex.
3.nounExcessive indulgence in a specified activity.