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。