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The Collaborative International Dictionary of English v.0.48 (gcide)

Jamboree \Jam`bo*ree"\, n. [Etym. uncertain. Cf. {Jambone}.]
1. A noisy or unrestrained carousal or frolic; a spree.
[Slang] --Kipling.

A Calcutta-made pony cart had been standing in front
of the manager's bungalow when Raja Singh started on
his jamboree. --W. A.
Fraser.
[Webster 1913 Suppl.]

2. a large festive gathering.
[PJC]

3. an assembly of boy scouts, usually at the national or
international level, including camping among the
activities; -- a term adopted by the Boy Scouts
organization.
[PJC]