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number one

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
4.
of the highest in quality, status, importance, etc.; first-rate:
a number one performance.
5.
first in rank, order, or prestige:
the number one book on the bestseller list.
Idioms
6.
make / do / go number one, Informal. to urinate: used especially by or with reference to children.
Origin of number one
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for number-one
Contemporary Examples
Historical Examples
  • Then from the bundle come strings of pearls, translucent jade of "number-one" quality, snuff-bottles fit for a museum.

    Peking Dust Ellen N. La Motte
  • Not number-one jade, of course, but still jade, and of value.

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

    The Jungle Book Rudyard Kipling
  • You ought to be mighty proud because all men think you are a number-one musher.

    Smoke Bellew Jack London
  • Among them was his number-one boy, Kwong, who had served him faithfully for several years.

    Civilization Ellen Newbold La Motte
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, chief: he'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
7.
first in importance, urgency, quality, etc: number one priority
8.
(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
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Slang definitions & phrases for number-one

Number One

noun phrase

  1. One's own self, esp as competitive with others; numero uno: Always look out for Number One, he says (1704+)
  2. Urination (1902+)

verb

: The little kid had to number one real bad

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Difficulty index for number one

Few English speakers likely know this word

Word Value for number

10
14
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Nearby words for number-one