English

Definition of onset noun from the Oxford Advanced Learner's Dictionary

 

onset

 noun
noun
BrE BrE//ˈɒnset//
 
; NAmE NAmE//ˈɑːnset//
 
, NAmE//ˈɔːnset//
 
[singular]
 
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the beginning of something, especially something unpleasant the onset of disease/old age/winterExtra examples His first hit record marked the onset of an astonishing career. Symptoms include the acute onset of pain. The development of pubic hair signals the onset of puberty. after the onset of sleep at the onset of the war the sudden onset of the disease An active and healthy lifestyle can delay the onset of disease in later life. the onset of illness/​infection/​disease/​depression/​AIDS/​symptoms/​shock/​menstruation/​puberty the onset of winter/​cold weather
See the Oxford Advanced American Dictionary entry: onset