number one
Americannoun
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oneself, especially one's own well-being or interests.
to look out for number one.
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a person, company, etc., that is first in rank, order, or prestige.
Our team is number one.
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urination: used especially by or with reference to children.
adjective
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of the highest in quality, status, importance, etc.; first-rate.
a number one performance.
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first in rank, order, or prestige.
the number one book on the bestseller list.
idioms
noun
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the first in a series or sequence
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an informal phrase for oneself myself
to look after number one
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informal the most important person; leader, chief
he's number one in the organization
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informal the bestselling pop record in any one week
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euphemistic the act or an instance of urination
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a haircut in which the hair is cut very close to the head with an electric shaver
adjective
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first in importance, urgency, quality, etc
number one priority
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informal (of a pop record) having reached the top of the charts
Other Word Forms
Noun Inflected Forms
Etymology
Origin of number one
First recorded in 1830–40
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
You may remember what Angels owner Arte Moreno said in spring training: “The number one thing fans want is affordability.”
From Los Angeles Times ● Jul. 29, 2026
The lead single Swim, a US number one, was also predicted to be in contention for song of the year.
From BBC ● Jul. 29, 2026
My number one goal now is to build bridges and maintain a relationship with families, because that’s what’s going to allow me to convince some of them.
From Los Angeles Times ● Jul. 28, 2026
She rose to global stardom with her 1972 album "No Secrets," which spawned the number one smash "You're So Vain."
From Barron's ● Jul. 27, 2026
Rule number one: Never settle for the first offer.
From "Merci Suárez Changes Gears" by Meg Medina
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
