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From The Collaborative International Dictionary of English v.0.48:
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]