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birthday

birthday /ˈbɚθˌdeɪ/ noun
plural birthdays
birthday
/ˈbɚθˌdeɪ/
noun
plural birthdays
Britannica Dictionary definition of BIRTHDAY
[count]
1 
: the day when someone was born or the anniversary of that day
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— often used before another noun
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2 
: the day when something began
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birthday suit

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