Jamboree used in English, as a borrowed foreign word, with the ending -ree. The word Jamboree is a transitive verb with a direct action of the primary word Jambo. For example, an attendee of a Jambo is a Jamboree. The word "Jamboree" is used primarily by the Scouting program before the first Boy Scout "Jamboree" in 1920. The word has also come to mean "a lavish or boisterous celebration or party" outside of the Scouting program. Baden-Powell deliberately chose the name "Jamboree" where attendees were warmly welcomed attending this first Boy Scout rally or meeting with the word "Jambo!" Many, at
International Boy Scouts, Troop 1 International Boy Scouts, Troop 1 International Boy Scouts, Troop 1 was founded in 1911 as Japan's first Scout troop and, despite its early multinational character, was originally registered with the London headquarters of the Boy Scouts as "British Scouts in Foreign Countries", which was the only option at the time due to the Boy Scouts' "nationality requirement" and no international Boy Scout office. The troop's character, and Scoutmaster, changed and it was recognized as a mixed-nationality, or "international" troop in 1918. After formation of the World Scout Bureau, Troop 1 became the first "mixed nationality" group to be registered directly