Synonyms of 'onset'
This drug slows down the onset of the disease.
Think of this as a new beginning.
She demanded to know why she had not been told from the start.
the birth of popular democracy
people awaiting the kick-off of the parade
On the outbreak of war he expected to be called up.
Since its inception, the company has produced 53 different designs.
All applicants should be at least 16 years of age at the commencement of this course.
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An assault by an army is a strong attack made on an area held by the enemy.
The rebels are poised for a new assault.
Attack is also a noun.
a campaign of air attacks on strategic targets
Thesaurus for onset from the Collins English Thesaurus
The onset of something is the beginning of it, used especially to refer to something unpleasant .