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.
00:10
Number one is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
number one
 
—n
1.  the first in a series or sequence
2.  oneself an informal phrase for 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
 
—adj
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

number one definition


  1. mod.
    top rate; best. (See also numero uno.) : We heard the number one high school band in the whole state last night.
  2. n.
    oneself. : I don't know who will pay for the broken window, but old number one isn't!
  3. n.
    urination; an act of urination. : Jimmy made a mess in his pants. But don't worry. It's just number one.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences
The only thing they know is who's number one and who's number two.
Sorry but this does not make sense the way this is being forced in the media
  and constantly the number one science topic.
It is the number one priority for astrophysics and is a flagship mission that
  cannot be done any other way.
Number one is there's always potential for some type of placebo effect any time
  you put a needle in anyway.
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