one2 S1 W1 plural ones
used to mean someone or something of a type that has already been mentioned or is known about:
'Have you got a camera?' 'No.' 'You should buy one' (=buy a camera).
The train was crowded so we decided to catch a later one (=catch a later train).
the one(s) (that/who/which)
The only jokes I tell are the ones that I hear from you.
this one/that one/these ones/those ones
I like all the pictures except this one.
used to mean someone or something from a group that has been mentioned or is about to be mentioned:
The children seemed upset. One was crying.
This is one of my favourite books.
used to talk about a particular person or thing in comparison with other similar people or things
One of the men sounded furious, the other frightened.
She has two daughters. One is a primary school teacher, the other a musician.
the person or people who:
I was the one who had been attacked, not Richard.
The only ones who will benefit are the shareholders.
used when one person or thing in a group does something, then the next, then the next, especially in a regular way:
One by one each soldier approached the coffin and gave a final salute.
if events happen one after the other, they happen without much time between them:
One after another, tropical storms battered the Pacific coastline.
if someone or something is many different things all in one, they are all those things:
It's a TV, radio and VCR all in one.
used to mean people in general, including yourself: ! This is a very formal use. People usually say or write you instead of 'one': You can never be too careful.
One can never be too careful.
Great pictures make one think.
used to emphasize that you believe something, will do something etc and hope others will do the same:
I, for one, am proud of the team's effort.
used to give an example of someone or something:
There were several other people absent that afternoon, weren't there? Mr Ashton for one.
to have or get an advantage over someone ➔ one-upmanship
to trick someone:
No one's going to put one over on me!
to feel very calm or relaxed in the situation or environment you are in:
She felt as she always did in these mountains: peaceful, without care, at one with nature.
to agree with someone about something:
He was at one with Wheatley on the need to abandon free trade.
used in particular phrases to mean 'an alcoholic drink':
How about a quick one at the pub?
have had one too many (=have drunk too much alcohol)
(have) one for the road (=have one last alcoholic drink before you leave a place)
a joke or humorous story:
Have you heard the one about the chicken who tried to cross the road?
if many people do something as one, they all do it at the same time:
The whole team stood up as one.
a particular kind of problem, question, story etc:
'What do you attribute your long life to?' 'Oh that's a difficult one'.
the same person or thing:
Muhammad Ali and Cassius Clay are one and the same.
to never do a particular thing, because it is not part of your character to do it:
Tom is not one to show his emotions.
to not enjoy a particular activity, subject etc:
I've never been a great one for watersports.
used to say that someone belongs to the same group as you, or has the same ideas, beliefs etc:
You can talk in front of Terry - he's one of us.
22 old-fashioned or formal
Apologies to one and all.
23 British English spoken
used to say that someone has correctly guessed or understood something immediately:
'You're not painting the house again are you?' 'Got it in one!'
used by some people to mean 'children', especially young children:
She's got four little ones.
25 British English old-fashioned
used to say that someone's behaviour is amusing, strange or surprising:
You are a one!