One
/wʌn/
Definitions
4 meaningsDenoting a single unit or individual.
/wʌn/
The cardinal number between zero and two.
I have one brother.
💡 Simply: Like when you have just one cookie, or when you're first in line! It's about having a single thing.
👶 For kids: One means just a single thing. Like, one toy, or one friend.
More Examples
There is one way to solve this problem.
She bought one ticket.
How It's Used
"I have one apple."
"One plus one equals two."
The number 1.
/wʌn/
The number or figure 1.
The sum of the numbers is one.
💡 Simply: It's the name of the number 1. When you write it, you're writing 'one'.
👶 For kids: One is the name of the number that means just one thing.
More Examples
She drew a one on her paper.
How It's Used
"The answer is one."
"He scored a one in the dice roll."
Referring to an unspecified person or thing.
/wʌn/
Used to refer to a person or thing previously mentioned or easily identified.
One should always be polite.
💡 Simply: It's like saying 'you' or 'people' in a general way. For example, 'One should always wash their hands' means anyone should.
👶 For kids: When we use 'one' to talk about people in general.
More Examples
One cannot predict the future.
One might think it is easy.
How It's Used
"One must always be kind."
"One does not simply walk into Mordor."
Being or amounting to a single unit or individual or entire thing, item, or amount.
/wʌn/
He had a one-track mind.
💡 Simply: When something is singular or exists as a single thing. For example, 'one way' or 'one choice'.
👶 For kids: When something is just a single thing, like one way to do something.
More Examples
The one thing that always works.
The one and only star.
How It's Used
"It was a one-time deal."
"I want the one with the red cover."
Idioms & expressions
one by one
Individually, separately, or in succession.
"The soldiers marched into the camp one by one."
in one go
Without stopping; all at once.
"She ate the whole pizza in one go."
at one time
In the past.
"At one time, he was a famous actor."
one of a kind
Unique, special, or unmatched.
"She's one of a kind."
one-track mind
The ability to think of only one thing.
"He has a one-track mind when it comes to sports."
From Old English "ān" (masculine/neuter) and "ān" (feminine), from Proto-Germanic *ainaz, from Proto-Indo-European *óynos.
The Old English word "ān" was used to express singular quantity and continues to be used in modern English for the same purpose.