one 1 S1 W1 / wʌn / number #

1 the number 1 :

They had one daughter.

one hundred and twenty-one pounds

Come back at one (= one o’clock ) .

Katie’s almost one (= one year old ) .

2 one or two a small number of people or things 同义词 a few :

There are one or two things to sort out before I leave.

one or two of

One or two of us knew him quite well.

3 in ones and twos British English alone or in pairs, rather than in large numbers or groups :

Guests arrived in ones and twos.

#

one 2 S1 W1 pronoun ( plural ones ) 1 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. 2 used to refer to a member of a group or pair of people or things :
The children seemed upset. One was crying. She has two daughters. One is a primary school teacher, the other is a musician. one of One of the girls I work with is getting married. This is one of my favourite books.

Grammar One of is followed by a plural noun but a singular verb :
One of the windows was open. 3 the one(s) who/that the person or people who :
I was the one who had been attacked, not Richard. The only ones who will benefit are the shareholders. 4 one by one 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. 5 one after another/one after the other if events happen one after the other, they happen without much time between them :
One after another, tropical storms battered the Pacific coastline. 6 (all) in one 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. 7 formal used to mean people in general, including yourself :
One can never be too careful. Great pictures make one think.

Register In everyday English, people usually use you rather than one : You can never be too careful. 8 I, for one, … 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. 9 … for one used to give an example of someone or something :
There were several other people absent that afternoon, weren’t there? Mr Ashton for one. 10 be one up (on somebody)/get one up on somebody to have or get an advantage over someone → one-upmanship 11 put one over on somebody informal to trick someone :
No one’s going to put one over on me! 12 be at one with somebody/something a) 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 . b) formal to agree with someone about something :
He was at one with Wheatley on the need to abandon free trade. 13 informal 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 ) 14 the one about … spoken a joke or humorous story :
Have you heard the one about the chicken who tried to cross the road? 15 as one written if many people do something as one, they all do it at the same time :
The whole team stood up as one. 16 a difficult/hard/good etc one a particular kind of problem, question, story etc :
‘What do you attribute your long life to?’ ‘Oh that’s a difficult one’. 17 one and the same the same person or thing :
Muhammad Ali and Cassius Clay are one and the same. 18 not/never be one to do something informal 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. 19 not/never be (a great) one for (doing) something informal to not enjoy a particular activity, subject etc :
I’ve never been a great one for watersports. 20 one of us spoken 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. 21 one and all old-fashioned or formal everyone :
Apologies to one and all. 22 got it in one! 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!’ 23 little/young ones spoken used by some people to mean ‘children’, especially young children :
She’s got four little ones. 24 you are/he is a one British English old-fashioned used to say that someone’s behaviour is amusing, strange, or surprising :
You are a one! → one-to-one

one 3 S1 W1 determiner #

1 used to emphasize a particular person or thing :
One person I find very difficult is Bob. If there’s one thing I can’t stand, it’s people who bite their nails. 2 one day/morning/year etc a) on a particular day, morning etc in the past :
One morning I was sitting at my desk when a policeman knocked at my door. b) used to talk about a day, morning etc in the future which is not yet exactly known or decided :
We should go out for a drink one evening. One day she hopes to move to the South Coast. 3 used to talk about a particular person or thing in comparison with other similar people or things :
Why does my card work in one cash machine and not in another ? 4 It’s one thing to … it’s (quite) another to used to say that the second thing mentioned is very different from the first, and is often much more difficult to do :
It’s one thing to say we have a goal; it’s another to actually act on it. 5 for one thing used to introduce a reason for what you have just said :
He couldn’t bring himself to say what he thought. For one thing , she seldom stopped to listen. For another , he doubted that he could make himself clear. 6 be one crazy woman/be one interesting job etc especially American English spoken to be a very crazy woman, be a very interesting job etc :
You’re one lucky guy. 7 formal used before the name of someone you do not know or have not heard of before SYN a certain :
He was accused of stealing a horse from one Peter Wright.

one 4 adjective [仅用于名词前] #

1 only :
Her one concern was to get to the door without being seen. Claire is the one person I can trust. 2 one and only a) used to emphasize that someone is very famous :
the one and only Frank Sinatra b) used to emphasize that something is the only one of its kind :
I even tried my one and only French joke on them.

one 5 noun [可数名词，通常复数] American English #

a piece of paper money worth one dollar :
I don’t have any ones.