Definition of number one adjective from the Oxford Advanced Learner's Dictionary

 

number one

 adjective
adjective
BrE
 
; NAmE
 
(informal)
 
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most important or best the world’s number one athlete the number one priority I just love your work! I’m your number one fan. Our number one priority is to find larger office space.
See the Oxford Advanced American Dictionary entry: number one

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