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Noun: number one
  1. A reference to yourself or myself etc.; 'take care of number one' means to put your own interests first
  2. The first or highest in an ordering or series
    "He wanted to be the number one";
    - first
  3. The first element in a countable series
    - first, number 1

Derived forms: number ones

Type of: no., ordinal, ordinal number, rank, self

Encyclopedia: Number one