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  1. Dictionary
    number one
    /ˌnʌmbə ˈwʌn/

    noun

    • 1. a person or thing that is foremost or most important in an activity or area: "businesses that were number one in their markets"
    • 2. used in reference to oneself: "you must look after number one"

    adjective

    • 1. most important or prevalent; foremost: "a number-one priority"

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