hi·lar·i·ous

[hi-lair-ee-uhs, -lar-, hahy-]
adjective
1.
arousing great merriment; extremely funny: a hilarious story; a hilarious old movie.
2.
boisterously merry or cheerful: a hilarious celebration.
3.
merry; cheerful.

Origin:
1815–25; < Latin hilar(is), hilar(us) cheerful (< Greek hilarós) + -ious

hi·lar·i·ous·ly, adverb
hi·lar·i·ous·ness, noun
hy·per·hi·lar·i·ous, adjective
hy·per·hi·lar·i·ous·ly, adverb
hy·per·hi·lar·i·ous·ness, noun
un·hi·lar·i·ous, adjective
un·hi·lar·i·ous·ly, adverb
un·hi·lar·i·ous·ness, noun


2. lively, jolly, rollicking, high-spirited.


2. sad, serious, solemn.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To hilarious
00:10
Hilarious is always a great word to know.
So is callithumpian. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
hilarious (hɪˈlɛərɪəs) [Click for IPA pronunciation guide]
 
adj
very funny or merry
 
[C19: from Latin hilaris glad, from Greek hilaros]
 
hi'lariously
 
adv
 
hi'lariousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

hilarious
1823, "cheerful," from L. hilaris (see hilarity) + -ous. Meaning "boisterously joyful" is from 1830s.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
People who aren't funny at all think they are hilarious.
He collected in his papers, accounts of people who thought this was hilarious.
He's heartbreaking and hilarious on the same page, and it's written with great
  emotion and intimacy.
Her personal tale is a mix of the ordinary, the tragic, the hilarious.
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