from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Characterized by or causing great merriment.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Very funny; causing great merriment and laughter.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Mirthful; noisy; merry.

from The Century Dictionary and Cyclopedia

  • Gleefully gay or merry; manifesting high spirits; exhilarated; jolly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. marked by or causing boisterous merriment or convulsive laughter


Latin hilaris, cheerful; see hilarity + -ious.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin hilaris ("cheerful"), from Ancient Greek ἱλαρός (hilaros, "cheerful, merry"), from ἵλαος (hilaos, "propitious, gracious, kind"). (Wiktionary)



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