Number One Definition

noun
Oneself.
He's always looking out for number one.
Webster's New World
The first or best in quality, standing, importance, etc.
Webster's New World
One's own interests; oneself.
Watching out for number one.
American Heritage
The act of urinating.
American Heritage
Urine or urination.
Webster's New World
adjective
First in rank, order, or importance.
The number one team in the nation; our number one problem.
American Heritage
Foremost in quality; first-rate.
Bought some number one farmland.
American Heritage

Other Word Forms of Number One

Noun

Singular:
number one
Plural:
number-ones

Idioms, Phrasal Verbs Related to Number One

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number one