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ENGLISH DICTIONARY

Noun
Pronunciation: /ˈbɜːθ.deɪ/
Pronunciation (ENPR): bûrthʹdā'

Definition 1:
• The anniversary of the day on which someone is born.
Example: When's your birthday? Mine's on April 1.
Example: I'll be thirty-seven (years old) next birthday.
Example: My fortieth birthday is only two years off!
Wiktionary-listed synonyms: natal day

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

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

Definition 4:
• A birthday party.
Example: I'd like to invite you all to my birthday.
Verb
Pronunciation: /ˈbɜːθ.deɪ/
Pronunciation (ENPR): bûrthʹdā'

Definition 1:
• To celebrate one's birthday.
Labels: informal, intransitive

Source and attribution
Wiktionary contributors, via Kaikki/Wiktextract. Derived from Wiktionary; CC BY-SA and GFDL terms apply. Source: https://en.wiktionary.org/wiki/birthday