An anniversary -LRB- from the Latin anniversarius , from the words for year and to turn , meaning -LRB- re -RRB- turning yearly ; known in MISC@1 since c. NUMBER@1 -RRB- is a day that commemorates and/or celebrates a past event that occurred on the same day of the year as the initial event .

An anniversary is a day that celebrates an event that happened on the same day and month , but in a past year .
