Meaning of “onset” in the English Dictionary

"onset" in English

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uk /ˈɒn.set/ us /ˈɑːn.set/


uk /-ˈɒn.set/ us /-ˈɑːn.set/

(of an illness or medical condition) starting at the stated time or in the stated way:

early-onset dementia
sudden-onset hearing loss

(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)