birthday /ˈbəːθdeɪ/

b

I. noun

1. the anniversary of the day on which a person was born, typically treated as an occasion for celebration and the giving of gifts.

his twenty-ninth birthday.
[as modifier]
a birthday cake.
2. the day of a person’s birth

he shares a birthday with Rod Stewart.
3. the anniversary of something’s origin or foundation

the seventy-fifth birthday of the Institute.
II. phrases

in one’s birthday suit

‹humorous› naked.

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