- (a.) Of or pertaining to the day of birth or its anniversary; as, birthday gifts or festivities.
- (n.) The day in which any person is born; day of origin or commencement.
- (n.) The day of the month in which a person was born, in whatever succeeding year it may recur; the anniversary of one's birth.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). birthday. Retrieved September 23, 2026, from http://smartdefine.org/birthday/definitions/1980528 |
| Chicago | Webster's. 2011. "birthday" http://smartdefine.org/birthday/definitions/1980528 (accessed September 23, 2026). |
| Harvard | Webster's 2011, birthday, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/birthday/definitions/1980528>. |
| MLA | Webster's. "birthday" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/birthday/definitions/1980528> |