Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “number one”

See all translations

number one

noun [U] uk   us  

number one noun [U] (YOURSELF)

( US also numero uno) informal yourself and no one else: Frank is completely selfish - he only cares about number one. I'm going to look out for number one (= take care of myself only).

number one noun [U] (THE BEST)

the most important, best, most noticeable, or most famous person or organization in a particular area of activity: She's still the world number one in tennis. I'm your number one fan.
Translations of “number one”
in Chinese (Traditional) 自己…
in Chinese (Simplified) 自己…
(Definition of number one from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of number one?
Add Cambridge dictionaries to your browser to your website

Definitions of “number one” in other dictionaries

Word of the Day

luck

the force that causes things, especially good things, to happen to you by chance and not as a result of your own efforts or abilities

Word of the Day

A certain je ne sais quoi: French words and phrases used in English

by Liz Walter,
January 21, 2015
It is an odd irony that the more sophisticated your use of English is, the more likely you are to use French words and phrases. Or, to be more accurate, ones you know to be French – words such as ballet, au pair, abattoir, fiancé, café, and restaurant are so entrenched in

Read More 

flower beard noun

January 19, 2015
a beard adorned with flowers And some of said beard-rockers are even turning it up a notch, painting trend on top of trend with what’s come to be known as ‘the flower beard.’

Read More