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English definition of “one-off”

one-off

adjective [always before noun]   /ˌwʌnˈɒf/ UK
only happening once: a one-off payment Rarely and infrequently
one-off noun [C] UK something that only happens once: His Olympic victory was not just a one-off.Rarely and infrequently
(Definition of one-off adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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