showing great joy, satisfaction, or triumph; rejoicing; exultant: the cheers of the jubilant victors; the jubilant climax of his symphony.

1660–70; < Latin jūbilant- (stem of jūbilāns, present participle of jūbilāre to shout, whoop), equivalent to jūbil- shout + -ant- -ant

jubilance, jubilancy, noun
jubilantly, adverb
unjubilant, adjective
unjubilantly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jubilant (ˈdʒuːbɪlənt)
feeling or expressing great joy
[C17: from Latin jūbilāns shouting for joy, from jūbilāre to give a joyful cry, from jūbilum a shout, wild cry]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1667, from L. jubilantem (nom. jubilans), prp. of jubilare "to call to someone," in Christian writers, "to shout for joy," related to jubilum "wild shout." First attested in Milton. Jubilation is much older in Eng. (1388), from O.Fr. jubilacion, from L. jubilationem (nom. jubilatio), from jubilare.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Several thousand jubilant supporters streamed to her residence.
Didn't mean to offend by sounding too jubilant.
The viewer may search for an underlying order but is inevitably caught up in
  the jubilant swirls of color.
Cairo exploded in a jubilant cacophony of car horns and cries of joy.
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