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onset

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The onset is the start or beginning of something, especially of something unpleasant.

(noun)

Sniffles and a sore throat might be described as examples of the onset of a cold.

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See onset in Webster's New World College Dictionary

noun

an attack; assault
a beginning; start

See onset in American Heritage Dictionary 4

noun

An onslaught; an assault.
A beginning; a start: the onset of a cold.
Linguistics The part of a syllable that precedes the nucleus. In the word nucleus (no͞oˈklē-əs), the onset of the first syllable is (n), the onset of the second syllable is (kl), and the last syllable has no onset.

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