the 60th anniversary of an important event, especially of somebody becoming king/queen; a celebration of this event 钻石大庆,60 周年庆典(尤指国王或女王登基 60 周年纪念日) Queen Victoria had been on the throne for 60 years and her diamond jubilee was being celebrated. 维多利亚女王已在位60年,庆贺她登基60周年的钻禧大庆正在举行。