of, pertaining to, or having the nature of an orgy.
2.
tending to arouse or excite unrestrained emotion:
orgiastic rhythms.
3.
Sociology. (of an expressive crowd) reaching a peak of emotional intensity, often of an ecstatic nature and frequently expressed by uninhibited behavior.
Origin
1690-1700; < Greekorgiastikós, derivative (with -tikos-tic) of orgiázein to celebrate orgies (derivative of órgia secret rites; see orgy)
Synonyms
1. wanton, licentious, debauched, riotous.
Examples from the web for orgiastic
An orgiastic ballet suggests the revelry that continues throughout the night.
Word Origin and History for orgiastic
adj.
1690s, from Greek orgiastikos "fit for orgies, exciting," from orgiastes "one who celebrates orgies," from orgiazein "to celebrate orgies," from orgia (see orgy).