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English definition of “anniversary”

anniversary

noun [C]     /ˌæn.ɪˈvɜː.sər.i/ US  /-ˈvɝː.sɚ-/
B1 the day on which an important event happened in a previous year : We always celebrate our wedding anniversary with dinner in an expensive restaurant . Tomorrow is the 30th anniversary of the revolution .Birthdays and anniversaries
(Definition of anniversary noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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