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

number one

adjective
 
/ˌnʌmbə ˈwʌn/
 
/ˌnʌmbər ˈwʌn/
(informal) [only before noun]
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  1. 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 number one in the Oxford Advanced American Dictionary
Check pronunciation: number one

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trait
noun
 
 
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