UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈraɪətəs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈraɪətəs/ ,USA pronunciation: respelling(rīə təs)

WordReference Random House Learner's Dictionary of American English © 2020
ri•ot•ous /ˈraɪətəs/USA pronunciation  adj. 
  1. of or relating to a riot:the riotous undergraduates; a riotous night on the town.

WordReference Random House Unabridged Dictionary of American English © 2020
ri•ot•ous  (rīə təs),USA pronunciation adj. 
  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;
    wanton:riotous living.
  4. boisterous or uproarious:riotous laughter.
  5. hilariously funny.
riot•ous•ly, adv. 
riot•ous•ness, n. 
  • 1300–50; Middle English; see riot, -ous

Collins Concise English Dictionary © HarperCollins Publishers::
riotous /ˈraɪətəs/ adj
  1. proceeding from or of the nature of riots or rioting
  2. characterized by wanton or lascivious revelry: riotous living
  3. characterized by boisterous or unrestrained merriment: riotous laughter

ˈriotously adv ˈriotousness n
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