Definition - number one

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number one
  1. a reference to yourself or myself etc.; `take care of number one'' means to put your own interests first
  2. a reference to yourself or myself etc.; `take care of number one' means to put your own interests first
  3. the first or highest in an ordering or series; "He wanted to be the first"
  4. the first element in a countable series; "the first of the month"
  5. the first or highest in an ordering or series; "He wanted to be the first"
  6. the first element in a countable series; "the first of the month"