Dictionary![]() ![]() num'ber one'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. make, do, or go number one, Informal.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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