Person I Emphasis Wʌn Year Time Number Determiner

• do you want one or two?
• there's only room for one person.
• one more, please!
• a one-bedroomed apartment

one

1. the number 1
• Do you want one or two?
• There's only room for one person.
• One more, please!
• a one-bedroomed apartment
• I'll see you at one (= one o'clock).
2. used in formal language or for emphasis before hundred, thousand, etc., or before a unit of measurement
• It cost one hundred and fifty pounds.
• He lost by less than one second.
3. used for emphasis to mean ‘a single’ or ‘just one’
• PAST TENSE, PAST PARTICIPLE OF win
  https://www.oxfordlearnersdictionaries.com/definition/english/win_1
• There's only one thing we can do.
4. a person or thing, especially when they are part of a group
• One of my friends lives in Brighton.
• One place I'd really like to visit is Bali.
5. used for emphasis to mean ‘the only one’ or ‘the most important one’
• He's the one person I can trust.
• Her one concern was for the health of her baby.
• It's the one thing I can't stand about him.
6. used when you are talking about a time in the past or the future, without actually saying which one
• I saw her one afternoon last week.
• One day (= at some time in the future) you'll understand.
7. the same
• They all went off in one direction.
8. used for emphasis instead of a or an
• That was one hell of a game!
• She's one snappy dresser.
9. used with a person’s name to show that the speaker does not know the person
• SYNONYM certain (5)
  https://www.oxfordlearnersdictionaries.com/definition/english/certain_1#certain_sng_4
• He worked as an assistant to one Mr Ming.
10. in agreement; all together
• We spoke as one on this matter.
11. to feel that you completely agree with somebody/something, or that you are part of something
• a place where you can feel at one with nature
12. a return to the situation you were in at the beginning of a project, task, etc., because you have made no real progress
• If this suggestion isn't accepted, we'll be back to square one.
13. to be the only person to have a particular opinion or to vote a particular way
14. used to emphasize that a particular person does something and that you believe other people do too
• I, for one, would prefer to postpone the meeting.
15. to understand or guess something immediately
• ‘Oh, so she’s his sister!’ ‘Got it in one!’
16. to get an advantage over somebody/something
• I'm not going to let them get one over on me!
17. to do something better than somebody else or than you have done before
• SYNONYM outdo
  https://www.oxfordlearnersdictionaries.com/definition/english/outdo
• She did well this year and next year she hopes to go one better.
18. used to say that somebody/something has different roles, contains different things or is used for different purposes
• SEE ALSO all-in-one
  https://www.oxfordlearnersdictionaries.com/definition/english/all-in-one
• She's a mother and company director in one.
• It's a public relations office, a press office and a private office all in one.
19. first one person or thing, and then another, and then another, up to any number or amount
• The bills kept coming in, one after another.
20. everyone
• Happy New Year to one and all!
21. used to emphasize that somebody is famous
• Here she is, the one and only Rihanna!
22. used for emphasis to mean ‘the same’
• I never realized Ruth Rendell and Barbara Vine were one and the same (= the same person using two different names).
23. separately and in order
• I went through the items on the list one by one.
24. a few
• We've had one or two problems—nothing serious.
25. having an advantage over somebody
26. used to say that all types of the things mentioned are very similar
• I don't like science fiction novels much. When you've read one, you've read them all.
27. a very long time ago
• I've been going there every summer since the year one.

Word Origin

• Old English ān, of Germanic origin; related to Dutch een and German ein, from an Indo-European root shared by Latin unus. The initial w sound developed before the 15th cent. and was occasionally represented in the spelling; it was not accepted into standard English until the late 17th cent.