Birthday
noun, verb, slang ·Very common ·Middle school level
Definitions
- 1 The anniversary of the day on which someone is born.
"When's your birthday? Mine's on April 1."
- 2 an anniversary of the day on which a person was born (or the celebration of it) wordnet
- 3 The anniversary of the day on which something is created.
- 4 the date on which a person was born wordnet
- 5 The date on which someone is born or something is created, more commonly called birthdate or date of birth.
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- 6 A birthday party.
"I'd like to invite you all to my birthday."
- 1 To celebrate one's birthday. informal, intransitive
Antonyms
All antonymsExample
More examples"Today is June 18th and it is Muiriel's birthday!"
Etymology
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.
Related phrases
More for "birthday"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.