Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

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.Beginnings and starts specialized phonetics the first part of a syllable
(Definition of onset from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of onset?
Add Cambridge dictionaries to your browser to your website

Definitions of “onset” in other dictionaries

Word of the Day

stampede

When animals or people stampede, they all move quickly in the same direction, often because they are frightened.

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More