Pronunciation: (rī'u-tus), [key]
1. (of an act) characterized by or of the nature of rioting or a disturbance of the peace.
2. (of a person) inciting or taking part in a riot.
3. given to or marked by unrestrained revelry; loose; wanton: riotous living.
4. boisterous or uproarious: riotous laughter.
5. hilariously funny.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.