Meaning of “jubilee” - Learner’s Dictionary

jubilee

noun [ C ] uk us /ˈdʒuːbɪliː/

a celebration of an important event in the past, usually one that happened 25 or 50 years ago:

a golden jubilee (= 50 years)
a silver jubilee (= 25 years)

(Definition of “jubilee” from the Cambridge Learner’s Dictionary © Cambridge University Press)