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

     

    number one

     noun
    noun
    BrE
     
    ; NAmE
     
    (informal) Selfish
     
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  1. 1[uncountable] the most important or best person or thing We're number one in the used car business.
  2. 2[uncountable, countable] the pop song or record that has sold the most copies in a particular week The new album went straight to number one. She's had three number ones.
  3. 3[uncountable] yourself Looking after number one is all she thinks about. See related entries: Selfish
  4. 4[singular] (informal) an expression used especially by children or when speaking to children to talk about passing liquid waste from the body It's only a number one. compare number two
See the Oxford Advanced American Dictionary entry: number one

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