Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “birthday”

See all translations

birthday

noun [C] uk   /ˈbɜːθ.deɪ/ us    /ˈbɝːθ-/
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
Translations of “birthday”
in Korean 생일…
in Arabic عيد ميْلاد…
in Portuguese aniversário…
in Catalan aniversari…
in Japanese 誕生日…
in Italian compleanno…
in Chinese (Traditional) 生日…
in Russian день рождения…
in Turkish doğum günü…
in Chinese (Simplified) 生日…
in Polish urodziny…
(Definition of birthday from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of birthday?
Add Cambridge dictionaries to your browser to your website

Definitions of “birthday” in other dictionaries

Word of the Day

exercise

physical activity that you do to make your body strong and healthy

Word of the Day

Byronic, Orwellian and Darwinian: adjectives from names.

by Liz Walter,
April 15, 2015
Becoming an adjective is a strange kind of memorial, but it is often a sign of a person having had real influence on the world. Science is full of examples, from Hippocrates, the Greek medic born around 460 BC, who gave his name to the Hippocratic Oath still used by doctors today,

Read More 

bio-inspiration noun

April 13, 2015
the adoption of patterns and structures found in nature for the purposes of engineering, manufacturing, science, etc. The MIT researchers actually aren’t the only robotics team to turn to cheetahs for bio-inspiration.

Read More