Definition of onset in English:

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onset

Pronunciation: /ˈɒnsɛt/

noun

1The beginning of something, especially something unpleasant: the onset of winter [as modifier, in combination]: early-onset Alzheimer’s disease
More example sentences
  • Already this year, the number of deaths has reached 32 and emergency chiefs fear the onset of poor winter weather may bring more.
  • The onset of winter appears to have been delayed, throwing many plants into confusion.
  • The parents said they then witnessed a regression in their children's behaviour and speech, as well as the onset of an unpleasant bowel disorder.
Synonyms
start, beginning, arrival, (first) appearance, opening, outset, inception;
outbreak, dawn, birth, infancy, genesis, creation, day one, emergence, rise
formal commencement
1.1 archaic A military attack.

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