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Definitions

onset

[on-set, awn-] / ˈɒnˌsɛt, ˈɔn- /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“Early onset breast cancer” — diagnosed before age 50 — “is going up the fastest among Asian Americans,” Gomez said.

From Los Angeles Times • Jun. 6, 2026

Next month's forecast is likely to be more accurate as to the onset of El Nino and its strength.

From Barron's • Jun. 2, 2026

The study found that a one year course of the biologic drug abatacept significantly delayed the onset of rheumatoid arthritis, with benefits continuing long after treatment ended.

From Science Daily • Jun. 1, 2026

Many oil-market analysts at the onset of the U.S.-Iran war said the global economy would start to feel the pinch of a virtually shut Strait of Hormuz as early as May.

From MarketWatch • May 26, 2026

Xan blamed the onset of old age and the crick in her back and the fussiness of the child, but none of those things was true.

From "The Girl Who Drank the Moon" by Kelly Barnhill




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