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English definition of “onset”

onset

noun uk   /ˈɒn.set/ us    /ˈɑːn-/
the onset of sth the moment at which something unpleasant begins: the onset of winter The new treatment can delay the onset of the disease by several years. specialized phonetics the first part of a syllable
(Definition of onset from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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