What does ONSET mean?

Here is the requested information about "onset": 1. Parts of Speech: Noun 2. Definitions: - The beginning or start of something, especially something unpleasant. - The point in time when symptoms of an illness or medical condition first appear. 3. Pronunciations: - US: /ˈɑnˌsɛt/ - UK: /ˈɒnset/ 4. Origin and Usage: - "Onset" originated from the Middle English word "onsettan" which means "to set upon." - It has been used in English since the 14th century to refer to the beginning or start of something. - In medical contexts, "onset" is used to describe the point in time when symptoms of an illness or medical condition first appear. 5. Synonyms: - Start, beginning, commencement, initiation, outset 6. Related Words: - Start, begin, early, launch, onset 7. Example Sentences: - The onset of winter brought heavy snowfall. - The onset of symptoms can be sudden or gradual. - The onset of the disease is usually marked by a fever.