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number one

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noun

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.

adjective

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.

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The rainy weather could not ________ my elated spirits on my graduation day.

Idioms for number one

    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. 2021

British Dictionary definitions for number one

number one

noun

adjective

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
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