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ENGLISH · A WORD WITH POSSIBILITIES

birthday.

The anniversary of the day on which someone is born.

8 characters2 syllables approx.English language

Meaning & usage

noun/ˈbɜːθ.deɪ/UK/ˈbɜːθ.dei/Received-Pronunciation/ˈbɝθˌdeɪ/Canada, US

  1. The anniversary of the day on which someone is born.

    When's your birthday? Mine's on April 1.
    I'll be thirty-seven (years old) next birthday.

  2. The anniversary of the day on which something is created.

  3. The date on which someone is born or something is created, more commonly called birthdate or date of birth.

  4. A birthday party.

    I'd like to invite you all to my birthday.
Where this word comes from

Etymology tree Proto-West Germanic *gaburdidag Old English ġebyrddæġ Middle English birthdai English birthday From Middle English birthdai, birtheday, from Old English ġebyrddæġ (“birthday”), influenced by Old Norse burðr, equivalent to birth + day. Compare Saterland Frisian Gebuursdai (“birthday”), Dutch geboortedag (“birthday”), Low German Geboortsdag (“birthday”), German Geburtstag (“birthday”), Norwegian bursdag, gebursdag (“birthday”). Eclipsed non-native Middle English nativitee (“birth, nativity, birthday”), from Old French nativité, nativited, from Latin nātīvitas.

verb/ˈbɜːθ.deɪ/UK/ˈbɜːθ.dei/Received-Pronunciation/ˈbɝθˌdeɪ/Canada, US

  1. To celebrate one's birthday.

    informal · intransitive
Where this word comes from

Etymology tree Proto-West Germanic *gaburdidag Old English ġebyrddæġ Middle English birthdai English birthday From Middle English birthdai, birtheday, from Old English ġebyrddæġ (“birthday”), influenced by Old Norse burðr, equivalent to birth + day. Compare Saterland Frisian Gebuursdai (“birthday”), Dutch geboortedag (“birthday”), Low German Geboortsdag (“birthday”), German Geburtstag (“birthday”), Norwegian bursdag, gebursdag (“birthday”). Eclipsed non-native Middle English nativitee (“birth, nativity, birthday”), from Old French nativité, nativited, from Latin nātīvitas.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.