- 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
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for number one
The musical promise of eternal youth sold to the tune of 5.5 million copies and five number-one singles.‘Prism’ Review: Katy Perry Perfects the Pop Blockbuster
October 22, 2013
But after logging her eighth number-one single, Katy Perry might be the biggest pop star of her time.Katy Perry Is Pop Music's Biggest Star
September 6, 2013
My husband in my number-one priority and I his; why would we want to change this so we can be slaves to a child?Why I Choose to Be Child-Free: Readers Share Their Stories
February 27, 2013
But the number-one thing rats want to be around is people, people who drop garbage on the ground.Hurricane Sandy Worsens N.Y. Rat Problem
October 31, 2012
The voting portion of the contest ended yesterday, and I swept the number-one spot.My Big, Fat Photo Spoof
September 9, 2011
"I've a very great mind to give you a number-one kicking," said Billy.The Jungle Book
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
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!
I guess you won't see such a number-one instep as yours any time on these effete old London side-walks.
- the first in a series or sequence
- an informal phrase for oneself, myself to look after number one
- informal the most important person; leader, chiefhe'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, etcnumber 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