number one Definition in Cambridge British English Dictionary
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Definition of "number one" - British English Dictionary

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number onenoun [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)
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