one Meaning in the Cambridge English Dictionary
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Meaning of “one” in the English Dictionary

"one" in British English

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onenumber, determiner

uk   us   /wʌn/

one number, determiner (NUMBER)

A1 the ​number 1: He had two ​slices and I only had one. She'll be one ​yearoldtomorrow.
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one number, determiner (MEMBER)

one of A2 a ​member of a ​group of ​people or things: One of ​theirdaughters has just had a ​baby. EMI is one of the world's ​largestrecordcompanies. Finding a ​cure for ​cancer is one of the ​biggestchallengesfacingmedical researchers. Our ​organization is just one of manycharities that are ​providingfaminerelief in the ​region.

one number, determiner (FUTURE TIME)

B2 used to refer to a ​time in the ​future that is not ​yetdecided: Why don't we ​meet for ​lunch one ​day next ​week? I'd like to go ​skiing one ​Christmas.
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one number, determiner (PARTICULAR OCCASION)

B2 used to refer to a ​particularoccasion while ​avoidingstating the ​exactmoment: One ​night we ​stayed up ​talking till ​dawn. He was ​attacked as he was ​walkinghome from ​work late one ​afternoon. One ​moment he says he ​loves me, the next ​moment he's ​asking for a ​divorce. She never ​seems to ​know what she's doing from one ​minute to the next.
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one number, determiner (SINGLE)

B2 a ​single thing; not two or more: Eat them one at a ​time (= ​separately). I ​think we should ​paint the ​bedroom all one (= in a ​single)colour.UK Do you ​think five of us will ​manage to ​squeeze into the one ​car?(all) in one C2 combined in a ​singleperson or ​object: With this ​model you get a ​radio, CD ​player, and ​MP3dock all in one.
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one number, determiner (ONLY)

B2 used when saying there is no other ​person or thing: He's the one ​person you can rely on in an ​emergency. This may be ​your one and only (= only ​ever)opportunity to ​meet her. My ​finalguest on tonight's show ​needs no ​introduction. Please ​welcome the one and only Michael Jordan!
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one number, determiner (UNKNOWN PERSON)

formal used before the ​name of someone who is not ​known: Her ​solicitor is one John Wintersgill.

one number, determiner (EMPHASIS)

mainly US used to ​emphasize an ​adjective: His ​mother is one (= a very)generous woman. That's one (= a very)bigicecreamcone you have there. It was one ​hell of a (= a very ​great)shock to ​find out I'd ​lost my ​job.

onepronoun

uk   us   /wʌn/

one pronoun (ONE THING/PERSON)

A2 used to refer to a ​particular thing or ​person within a ​group or ​range of things or ​people that are ​possible or ​available: I have a few ​books on ​Chinesefood. You can ​borrow one if you ​want. Which one would you like? Please make a ​copy for everybody in the ​office and a few ​extra ones for the ​visitors. "Which ​cake would you like?" "The one in the ​front." Frenchcroissants are so much ​better than the ones we get here. There were ​lots of ​peoplewatching, and not one of them ​offered to ​help. I've ​received no ​replies to my ​jobapplications - not a ​single one (= none). Chris is the one (= the ​person) with ​curlybrownhair.not be one to do sth UK informal to never do something: I'm not one to ​criticize other ​people, as you ​know.be one for sth informal to like something very much: I've never been one for ​staying out late. He's a great one for the ​ladies.
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one pronoun (COMPARISON)

used to ​talk about one ​person or thing ​compared with other ​similar or ​relatedpeople or things: They ​look so ​similar it's often ​difficult to ​distinguish one from the other. You may have one or the other, but not both. Crime and ​freedom are ​inseparable. You can't have one without the other.
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one pronoun (ANY PERSON)

C1 formal any ​person, but not a ​particularperson: One has an ​obligation to one's ​friends. One ought to make the ​effort to ​vote.
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one pronoun (I/ME)

formal the ​personspeaking or writing: Of ​course, one (= I) would be ​delighted to ​dine with the Queen.
(Definition of one from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"one" in American English

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onenumber

 us   /wʌn/

onepronoun, adjective [not gradable]

 us   /wʌn/

one pronoun, adjective [not gradable] (SINGLE)

not two or more: There are too many of us to ​fit in just one ​car.

one pronoun, adjective [not gradable] (PARTICULAR THING/PERSON)

used to refer to a ​particular thing or ​person within a ​group or ​range of things or ​people: There are ​lots of ​flavors – which one would you like? He ​advisedworkers around him, ​especially the ​youngerones, to be ​patient. Kayla is the one with ​darkbrownhair. Make ​sure the ​ones that we've got there do what you ​want them to do. She is one ​beautiful woman (= she is very ​beautiful). Why don’t we ​meet for ​lunch one ​day next ​week?one of To be one of a ​group of ​people or things is to be a ​member of that ​group: It’s one of the most ​popularsongs.

oneadjective [not gradable]

 us   /wʌn/

one adjective [not gradable] (ONLY)

used when saying there is no other ​person or thing: He’s the one ​person you can rely on in an ​emergency.

onepronoun

 us   /wʌn/ fml

one pronoun (ANY PERSON)

any ​person, but not a ​particularperson: One ought to make the ​effort to ​vote.
(Definition of one from the Cambridge Academic Content Dictionary © Cambridge University Press)
Translations of “one”
in Korean 1, 일, 한 명…
in Arabic واحِد, أحَد, في يَوْم مِنْ الأيّام…
in Malaysian satu, setahun…
in French un, un an…
in Russian один…
in Chinese (Traditional) 數字, (數字)1…
in Italian uno, una cosa, unico…
in Turkish bir…
in Polish jeden…
in Spanish uno, un año…
in Vietnamese số 1, 1 tuổi…
in Portuguese um, uma, qualquer…
in Thai เลขหนึ่ง, 1 ขวบ…
in German die Eins…
in Catalan u, un, algun…
in Japanese 1, 1の, 1人…
in Chinese (Simplified) 数字, (数字)1…
in Indonesian satu, umur satu tahun…
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