Definition of number one
- looking out for number one
Who's number one in this office?
Getting the car fixed is number one on my list of priorities.
I'll tell you why we can't go on a vacation: number one, we can't afford it, and number two, we'll miss my sister's party.
Her movie is currently number one at the box office.
When the goal was scored, the fans started to chant, “We're number one, we're number one.”
I've been taking care of other people for too long. It's time for me to take care of number one.
The book is the company's number one seller.
Rule number one is don't get caught!
He's public enemy number one: the nation's most wanted criminal.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'number one.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: a person, thing, or position that is highest in rank : the most important person or thing in a group of people or things
: the most successful person or thing in a group of people or things
: your own happiness, health, or success
: highest in rank or importance
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