number one


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.

Idioms

    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. 2019

Examples from the Web for number one

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