Birthday Definition

bûrthdā
noun
The day of one's birth.
American Heritage
The day of a person's birth or a thing's beginning.
Webster's New World
The anniversary of one's birth.
American Heritage
The anniversary of this day.
Webster's New World

The anniversary of the day on which someone is born. [From 1570s]

Wiktionary
Synonyms:

Other Word Forms of Birthday

Noun

Singular:
birthday
Plural:
birthdays

Idioms, Phrasal Verbs Related to Birthday

  • in one's birthday suit

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birthday