1. the yearly recurrence of the date of a past event

Examples

• They celebrated their wedding anniversary with a romantic dinner.
• The company marked its 50th anniversary with a special ceremony.
• Today is the anniversary of the moon landing.
• We always visit the cemetery on the anniversary of his death.
• The school’s anniversary celebration included speeches and awards.
• Their first anniversary as a couple was very special.
• The anniversary of the treaty is observed as a national holiday.