onset

[ on-set, awn- ]
/ ˈɒnˌsɛt, ˈɔn- /

noun

a beginning or start: the onset of winter.
an assault or attack: an onset of the enemy.
Phonetics. the segment of a syllable preceding the nucleus, as the gr in great.Compare coda (def. 5), core1 (def. 14).

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Origin of onset

1525–35; on + set, after the verb phrase set on
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for onset

British Dictionary definitions for onset

onset
/ (ˈɒnˌsɛt) /

noun

an attack; assault
a start; beginning
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for onset

onset
[ ŏnsĕt′ ]

n.

A beginning; a start, as of a cold.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.