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English definition of “once”

once

adverb     /wʌns/
ONE TIME A2 one time: It's only snowed once or twice this year. I go swimming once a week (= one time every week).Rarely and infrequently
NOT NOW B1 in the past, but not now: This house once belonged to my grandfather.In the past
once again B1 again: Once again I'm left with all the washing up.Continually and repeatedly
all at once suddenly: All at once he stood up and walked out of the room.Not expected or planned
at once B1 immediately: I knew at once that I would like it here.Immediately at the same time: They all started talking at once.Simultaneous and consecutiveOrder and sequence
once in a while B2 sometimes but not often: He plays tennis once in a while.Rarely and infrequently
once and for all If you do something once and for all, you do it now so that it does not have to be dealt with again: Let's get to the bottom of this matter once and for all!Intensifying expressionsComplete and wholeVery and extreme
once more B1 one more time: If you say that once more, I'm going to leave.Continually and repeatedly
for once B2 used to mean that something is happening that does not usually happen: For once, I think I have good news for him.Unique and unusualGood, better and best in terms of quality
once upon a time B1 used at the beginning of a children's story to mean that something happened a long time ago → See also once in a blue moonIn the past
(Definition of once adverb from the Cambridge Learner's Dictionary © Cambridge University Press)

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