number one

See more synonyms for number one on Thesaurus.com
noun
  1. oneself, especially 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. urination: used especially by or with reference to children.
adjective
  1. of the highest in quality, status, importance, etc.; first-rate: a number one performance.
  2. first in rank, order, or prestige: the number one book on the bestseller list.
Idioms
  1. make/do/go number one, Informal. to urinate: used especially by or with reference to children.

Origin of number one

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for number one

winner, champion, hero, leader, master

Examples from the Web for number one

Contemporary Examples of number one

Historical Examples of number one

  • "I've a very great mind to give you a number-one kicking," said Billy.

    The Jungle Book

    Rudyard Kipling

  • Not number-one jade, of course, but still jade, and of value.

    Civilization

    Ellen Newbold La Motte

  • You ought to be mighty proud because all men think you are a number-one musher.

    Smoke Bellew

    Jack London

  • You've got thirty tons of fuel—you want to find the compression ratio of the number-one firing-tube chamber—so what do you do?

    Stand by for Mars!

    Carey Rockwell

  • I guess you won't see such a number-one instep as yours any time on these effete old London side-walks.


British Dictionary definitions for number one

number one

noun
  1. the first in a series or sequence
  2. an informal phrase for oneself, myself to look after number one
  3. informal the most important person; leader, chiefhe's number one in the organization
  4. informal the bestselling pop record in any one week
  5. euphemistic the act or an instance of urination
  6. a haircut in which the hair is cut very close to the head with an electric shaver
adjective
  1. first in importance, urgency, quality, etcnumber one priority
  2. informal (of a pop record) having reached the top of the charts
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012