Birthday

Anniversary of a person's birth or an event.

birth date natal day

A birthday is a person's anniversary of birth, or the anniversary of an event.

/ˈbɜːrθdeɪ/

The word 'birthday' is a compound of 'birth' and 'day', referring to the day someone is born.

natal anniversary birth anniversary

anniversary event

graduation day wedding anniversary

calendar year

celebration cultural practice