/ ˈdʒuːbɪlənt; NAmE / adjective
feeling or showing great happiness because of a success
► ju·bi·lant·ly adverb
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WORD ORIGIN
mid 17th cent. (originally in the sense making a joyful noise ): from Latin jubilant- calling, hallooing, from the verb jubilare , used by Christian writers to mean shout for joy.