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number one

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noun number one pronunciation in American English 
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singularnumber one
pluralnumber ones
  1. 1
    [singular] the person or thing that is first in order or importance

    The team is number one in the regional game.

  2. 3
    [singular] mainly spoken used for talking about yourself
    look out for number one (=protect your own needs and interests):

    You've got to look out for number one – no-one else will.

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selfie stick

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