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number one

oneself, especially one's own well-being or interests:
to look out for number one.
a person, company, etc., that is first in rank, order, or prestige:
Our team is number one.
urination: used especially by or with reference to children.
of the highest in quality, status, importance, etc.; first-rate:
a number one performance.
first in rank, order, or prestige:
the number one book on the bestseller list.
make / do / go number one, Informal. to urinate: used especially by or with reference to children.
Origin of number one
1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for number one
  • The only thing they know is who's number one and who's number two.
  • Concrete, the number one construction material, is a major source of climate-warming gases.
  • That's why vaccines are the foundation's number one priority.
  • At many universities, research is the number one criteria for tenure.
  • As an organizer, ensuring this is your number one priority.
  • Nothing against business, but it was the number one major at the school.
  • High blood pressure is the number one risk factor for strokes.
  • number one is there's always potential for some type of placebo effect any time you put a needle in anyway.
  • Extracting methane from sewage should be ranked as number one solution.
  • Lower cost is the number one factor responsible for its anticipated growth, but there are trade-offs as well.
British Dictionary definitions for number one

number one

the first in a series or sequence
an informal phrase for oneself, myself to look after number one
(informal) the most important person; leader, chief: he's number one in the organization
(informal) the bestselling pop record in any one week
(euphemistic) the act or an instance of urination
a haircut in which the hair is cut very close to the head with an electric shaver
first in importance, urgency, quality, etc: number one priority
(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+)

: 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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