jamboree

[ jam-buh-ree ]
/ ˌdʒæm bəˈri /

noun

a carousal; any noisy merrymaking.
a large gathering, as of a political party or the teams of a sporting league, often including a program of speeches and entertainment.
a large gathering of members of the Boy Scouts or Girl Scouts, usually nationwide or international in scope (distinguished from camporee).

Origin of jamboree

1860–65, Americanism; apparently blend of jabber and shivaree, with m from jam1 crowd
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British Dictionary definitions for jamboree

jamboree
/ (ˌdʒæmbəˈriː) /

noun

a large and often international gathering of Scouts
a party or spree

Word Origin for jamboree

C19: of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012