Tra từ orgy - Từ điển American Heritage Dictionary 4th

or·gy (ôrʹjē)n. pl. or·gies
1. A revel involving unrestrained indulgence, especially sexual activity.
2. Uncontrolled or immoderate indulgence in an activity:
an orgy of spending.
See Synonyms at binge.
3. A secret rite in the cults of ancient Greek or Roman deities, typically involving frenzied singing, dancing, drinking, and sexual activity. [From orgies, secret rites, from Old French, from Latin orgia, from Greek. See werg- in Indo-European Roots.]
Word History: The word orgy has become connected in the minds of many of us with unrestrained sexual activity, but its origins are much less licentious. We can trace the word as far back as the Indo-European root *werg-, meaning “to do,” also the source of our word work. Greek orgia, “secret rites, worship,” comes from *worg-, one form of this root. The Greek word was used with reference to the rites practiced in the worship of various deities, such as Orpheus and Dionysus. The word in Greek did not denote sexual activity, although this was a part of some rites. The rites of Dionysus, for example, included only music, dancing, drinking, and the eating of animal sacrifices. Having passed through Latin and Old French into English, the word orgy is first recorded in English with reference to the secret rites of the Greek and Roman religions in 1589. It is interesting to note that the word is first recorded with its modern sense in 18th-century English and perhaps in 17th-century French. Whether this speaks to a greater licentiousness in society or not must be left to the historian, but certainly the religious nature of the word has gone into eclipse.