Anniversary/ˌænɪˈvɜːrsəri/ Definition 1 of 2Pro Tip 1/3Specific Date Anniversary refers to the exact date, not just a time period or month. Our anniversary is on June 5th, the same day we met. Pro Tip 2/3Annual Event An anniversary occurs every year, marking the same event. Each year on our anniversary, we revisit our first date spot. Pro Tip 3/3Celebration Tones Anniversaries often involve celebration or recognition of importance. Our 10th anniversary calls for a grand celebration!