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Meaning of number one

num'ber one'

Pronunciation: [key]
  1. oneself, esp. one's own well-being or interests: to look out for number one.
  2. a person, company, etc., that is first in rank, order, or prestige: Our team is number one.
  3. of the highest in quality, status, importance, etc.; first-rate: a number one performance.
  4. first in rank, order, or prestige: the number one book on the bestseller list.
  5. urination: used esp. by or with reference to children.
  6. to urinate: used esp. by or with reference to children.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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