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birthday

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birthday/ˈbɚθˌdeɪ/noun
pluralbirthdays
birthday
/ˈbɚθˌdeɪ/
noun
pluralbirthdays
Learner's definition of BIRTHDAY  
[count]
: the day when someone was born or the anniversary of that day — often used before another noun
: the day when something began

birthday suit

informal + humorous
◊ If you are wearing your birthday suit, you are naked.
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