📒 on one occasion only; one time
- I've only been there once.
- He cleans his car once a week.
- She only sees her parents once every six months.
📒 at some time in the past
- I once met your mother.
- He once lived in Zambia.
- This book was famous once, but nobody reads it today.
📒 used in negative sentences and questions, and after if to mean ‘ever’ or ‘at all’
- He never once offered to help.
- If she once decides to do something, you won't change her mind.
📒 used with a preposition or another adverb to mean ‘as soon as somebody/something is/was’
- Once inside the gate, Sam hurried up the path.
📒 suddenly
- All at once she lost her temper.
📒 all together; at the same time
- I can't do everything all at once—you'll have to be patient.
📒 immediately; without delay
📒 at the same time
- Don't all speak at once!
- I can't do two things at once.
📒 on this occasion (which is in contrast to what happens usually)
- Just for once he arrived on time.
- Can't you be nice to each other just this once?
📒 said by an auctioneer to show that an item has been sold
📒 one more time; another time
- Once again the train was late.
- Let me hear it just once more.
📒 used to say that somebody cannot change
- Once an actor, always an actor.
📒 after an unpleasant experience you are careful to avoid something similar
📒 now and for the last time; finally or completely
- We need to settle this once and for all.
📒 very rarely
📒 occasionally
- Everybody makes a mistake once in a while.
📒 a few times
- I don't know her well, I've only met her once or twice.
📒 used to say that somebody has done something wrong or stupid again, and this time they will suffer because of it
- You've tried that trick once too often.
📒 used, especially at the beginning of stories, to mean ‘a long time ago in the past’
- Once upon a time there was a beautiful princess.