Onset Definition

ŏnsĕt, ôn-
noun
A beginning; start; appearance.
The onset of symptoms.
Webster's New World
An attack; assault.
Webster's New World
The part of a syllable that precedes the nucleus. In the word nucleus (no͝o&STRESS;klē-əs), the onset of the first syllable is (n), the onset of the second syllable is (kl), and the last syllable has no onset.
American Heritage

(medicine) The initial phase of a disease or condition, in which symptoms first become apparent.

Wiktionary

(acoustics) The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.

Wiktionary
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verb
(obsolete) To assault; to set upon.
Wiktionary
(obsolete) To set about; to begin.
Wiktionary

Other Word Forms of Onset

Noun

Singular:
onset
Plural:
onsets

Origin of Onset

  • From on- +"Ž set. Compare Old English onsettan (“to impose; oppress, bear down").

    From Wiktionary

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