number one
Americannoun
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number ones
plural
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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.
Scotland's Robert MacIntyre and American world number one Scottie Scheffler carded 68s to finish in a group of eight on five under, with England's Aaron Rai and Matthew Fitzpatrick a shot behind.
From BBC ● Aug. 23, 2026
Steiner is perplexed about the attacks on the school: “I’m not sure the Bauhaus is the number one topic for the people of Dessau,” she adds.
From The Wall Street Journal ● Aug. 23, 2026
Other high-profile pairings include world number one Aryna Sabalenka with 24-time major champion Novak Djokovic, American pair Jessica Pegula and Taylor Fritz, and six-time major champion Iga Swiatek and Casper Ruud.
From BBC ● Aug. 22, 2026
“The number one goal is still to reach consensus,” Travnicek said.
From Los Angeles Times ● Aug. 21, 2026
Sometimes, I couldn’t help remembering he was Momma’s number one ally, that she stuck with him and not with me.
From "Hope Springs" by Jaime Berry
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.
