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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.
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 especially by or with reference to children.
Idioms
6.
make / do / go number one, Informal. to urinate: used especially by or with reference to children.
Origin
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
Scrabble Words With Friends

Quotes with number-one