Definition of diamond jubilee noun from the Oxford Advanced Learner's Dictionary

 

diamond jubilee

 noun
noun
BrE
 
; NAmE
 
[usually singular]
 
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the 60th anniversary of an important event, especially of somebody becoming king/queen; a celebration of this event Queen Victoria had been on the throne for 60 years and her diamond jubilee was being celebrated. compare golden jubilee, silver jubilee