birthday

play
noun birth·day \ˈbərth-ˌdā\

Definition of birthday

  1. 1a :  the day of a person's birthb :  a day of origin

  2. 2 :  an anniversary of a birth <her 21st birthday>

Examples of birthday in a sentence

  1. Her birthday is September 30th.

  2. Today is his 21st birthday.

  3. The company just celebrated its 50th birthday.

14th Century

First Known Use of birthday

14th century


BIRTHDAY Defined for English Language Learners

birthday

play
noun birth·day \ˈbərth-ˌdā\

Definition of birthday for English Language Learners

  • : the day when someone was born or the anniversary of that day

  • : the day when something began


BIRTHDAY Defined for Kids

birthday

play
noun birth·day \ˈbərth-ˌdā\

Definition of birthday for Students

  1. 1 :  the day or anniversary of someone's birth

  2. 2 :  a day of beginning <Our town just celebrated its 150th birthday.>



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