anniversary
nounUK /ˌænɪˈvɜːsəri/
US /ˌænɪˈvɜːrsəri/
A special day that comes back every year to remember something that happened.
My parents celebrate their wedding anniversary every June.
OTHER MEANINGS
2. The yearly return of a date marking an important event.
The town held a parade on the anniversary of its founding.
3. A date that repeats each year and is noted for a past event.
Today is the anniversary of the first moon landing.
4. A recurring yearly occasion used for celebration or reflection.
They marked their tenth anniversary with a small party.