JAMBOREE Meaning of JAMBOREE in English [ ˌdʒambə'ri: ]■ noun1》 a lavish or boisterous celebration or party. 2》 a large rally of Scouts or Guides.OriginC19 (orig. US sl.): of unknown origin. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004