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Definition of birthday

birthday

/ˈbɜːrθ.deɪ/
birth · day
Plural:birthdays
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birthday Lexical Profile

birthday Game Scores & Validity

• noun

1

The anniversary of the day on which a person was born, typically treated as an occasion for celebration and the giving of gifts.

Example

"We are planning a surprise dinner for her thirtieth birthday this weekend."

2

The exact day and year of a person's birth, or the date of the founding or beginning of an institution or thing.

Example

"Please write your full name and birthday at the top of the registration form."

Synonyms
View all synonyms for birthday

• Rhymes for birthday

• Nearby Words

birria
birth
birthdate
birthday
birther
birthmark
birthmother

Word Origin & Etymology

From Old English 'byrddæg', a compound formed from 'byrd' (birth) and 'dæg' (day), originally used to commemorate the natal day of saints or monarchs before becoming common for ordinary individuals.

Cite this Entry

Wordmom. (2026). Definition of Birthday. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/birthday
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