Definition of birthday

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  • birthday is a valid Scrabble US word with a point value of 17
  • birthday is a valid Scrabble UK word with a point value of 17
  • birthday is a valid Words with friends word with a point value of 16

Definition of birthday

  • the date on which a person was born (noun)

    Synonyms

    1. natal day
  • an anniversary of the day on which a person was born (or the celebration of it) (noun)

See definition of birthday in Merriam Webster