birthdaynoun [ C ]
uk/ˈbɜːθ.deɪ/us/ˈbɝːθ.deɪ/A1 the day that is exactly a year or number of years after a person was born:
Happy birthday, Flavio!
Are you going to Ellen's birthday party next week?
It's her 21st birthday.
More examples
- My birthday is on the fourth of December.
- Her birthday was getting nearer and I still hadn't bought her a present.
- My birthday is on a Friday this year.
- They sent her flowers for her birthday.
- I didn't even see her to wish her a happy birthday.
Thesaurus: synonyms and related words
Describing age & birthdays
- a ripe old age idiom
- age group
- age limit
- aged
- be knocking (on) 60, 70, etc. idiom
- gone
- junior
- octogenarian
- old
- on the right/wrong side of 40, 50, etc. idiom
- put years on sb idiom
- rising
- senior
- take years off sb idiom
- teens
- this side of sth idiom
- turn
- twenty-first
- when sb was a (mere) twinkle in their father's eye idiom
- year
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You can also find related words, phrases, and synonyms in the topics:
Birthdays & anniversaries
Idiom(s)
in your birthday suit