Meaning of “onset” in the English Dictionary

american-english dictionary

"onset" in British English

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(Definition of “onset” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"onset" in American English

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onsetnoun [ U ]

us /ˈɔn·set, ˈɑn-/

the beginning of something:

We have to get the roof fixed before the onset of winter.

(Definition of “onset” from the Cambridge Academic Content Dictionary © Cambridge University Press)