/ Dictionary / Index H hilarity: Meaning and Definition of Find definitions for: hi•lar•i•ty Pronunciation: (hi-lar'i-tē, -lâr'-, hī-), [key] — n. cheerfulness; merriment; mirthfulness. boisterous gaiety or merriment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hilarity (Thesaurus) hilarious Hilarius Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language