Longman Dictionary of Contemporary English homepage

birthday

 noun
     
Related topics: Chronology
birth‧day S2 W3 [countable]
1TMC your birthday is a day that is an exact number of years after the day you were born:
He was in Kansas to celebrate his 74th birthday.
happy birthday! (=what you say on someone's birthday)
birthday card/gift/party etc
Anne's birthday party
the birthday girl/boy informal (=the person whose birthday it is)
2 a day that is an exact number of years since an organization was established or an event first happened [↪ anniversary]:
The City of Cleveland Orchestra is celebrating its 200th birthday.
3

in your birthday suit

informal not wearing any clothes - used humorously
Definition from the Longman Dictionary of Contemporary English
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