one
//wʌn//
numeral
The cardinal number between zero and two; a single unit or entity.
I have one apple.
Noun
A single person or thing; an individual unit.
I'll take the red one.
The number 1 as a written symbol or numeral.
Write a one on the paper.
A one-dollar bill or one-pound note.
Do you have change for a one?
Pronoun
Used to refer to any person in general, including the speaker.
One should always be kind to others.
Used to refer to a person or thing previously mentioned or easily identified.
I need a new phone. The old one doesn't work anymore.
Determiner
Used to indicate a single person or thing as distinct from others.
One student raised her hand to ask a question.
Used to refer to a particular but unspecified occasion or time.
One day, I hope to visit Japan.
Adjective
Single; forming a unity; united.
They spoke with one voice on the issue.
The same; identical.
We are all of one mind on this issue.