- Of a significant event, a day that is an exact number of years (to the day) since the event occurred; often preceded by an ordinal number indicating the number of years that have elapsed since the event.
Etymology: From the Latin adjective anniversarius, "returning yearly", from vertere, "to turn", + annus, "year".
- Today is the fiftieth anniversary of the end of the war.
- Specifically, a wedding anniversary.
- We are celebrating our tenth anniversary today.
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Full Definition of anniversary