Definitions

1. noun

A day or period of commemoration marking the anniversary of a particular event or occasion, especially the first anniversary of a wedding or other significant event.

“They celebrated their fifth anniversary with a romantic dinner.”

2. noun

A date marking the beginning of a period of time, especially a period of employment or service.

“After 10 years of service, he celebrated his anniversary as a police officer.”

3. noun

A date marking the beginning of a period of time, especially a period of time spent in a particular place.

“She had spent 20 years in the city and was looking forward to her anniversary of moving to the countryside.”