Definition of number one noun from the Oxford Advanced American Dictionary

     

    number one

     noun
    noun
     
    (informal)
     
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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 song or album (= collection of songs) that has sold the most copies in a particular week She's had three number ones. The new album went straight to number one.
  3. 3 [uncountable] yourself Looking out for number one is all she cares about.
  4. 4[singular] 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 Learner's Dictionary entry: number one

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