Dictionary
hi•lar•i•ous
Pronunciation: (hi-lâr'ē-us, -lar'-, hī-), [key]—
adj.
1. arousing great merriment; extremely funny:
a hilarious story; a hilarious old movie.
2. boisterously merry or cheerful:
a hilarious celebration.
3. merry; cheerful.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.