Meaning of the word onset in English

What does onset mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

onset

US /ˈɑːn.set/
UK /ˈɒn.set/
"onset" picture

Noun

the beginning of something, especially something unpleasant

Example:
The onset of winter brought cold weather.
Early onset of the disease makes it harder to treat.