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number one

noun [U] (THE BEST)
 
 

Definition

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.Winners and losersImportant people and describing important peopleFamous peopleWealthy people
(Definition of number one noun (THE BEST) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“number one” in other dictionaries

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