/ Dictionary / Index H hilarious: Meaning and Definition of Find definitions for: hi•lar•i•ous Pronunciation: (hi-lâr'ē-us, -lar'-, hī-), [key] — adj. arousing great merriment; extremely funny: a hilarious story; a hilarious old movie. boisterously merry or cheerful: a hilarious celebration. merry; cheerful. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hilarious (Thesaurus) hike hilarity Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language