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
1909 Crystal Palace Scout Rally 1909 Crystal Palace Scout Rally The Crystal Palace Rally was an historic gathering of Boy Scouts and unofficial "Girl Scouts" at the Crystal Palace in London on Saturday, 4 September 1909. The rally demonstrated the rapid popularization of Scouting with an estimated 11,000 boys attending with the prominent presence of Girl Scouts also being significant for the start of Girl Guides/Scouts. The rally was held a year and a half after the publication of "Scouting for Boys" and "The Scout" magazine, and two years after Robert Baden-Powell's demonstration Brownsea Island Scout Camp. Some controversy occurred with attempts to exclude girls