on·set

[on-set, awn-]
noun
1.
a beginning or start: the onset of winter.
2.
an assault or attack: an onset of the enemy.
3.
Phonetics. the segment of a syllable preceding the nucleus, as the gr in great. Compare coda ( def 5 ), core1 ( def 14 ).

Origin:
1525–35; on + set, after the verb phrase set on

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
onset (ˈɒnˌsɛt) [Click for IPA pronunciation guide]
 
n
1.  an attack; assault
2.  a start; beginning

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Onset is always a great word to know.
So is consonant. Does it mean:
any sound other than the sound of greatest sonority in a syllable
articulated with the aid of the tongue, especially the tip of the tongue
Etymonline
Word Origin & History

onset
1530s, "attack, assault," from on + set (n.); cf. to set (something) on (someone). Weaker sense of "beginning, start" first recorded 1560s. Figurative use in reference to a calamity, disease, etc. is from 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

onset on·set (ŏn'sět')
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.
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Example sentences
Symptoms can develop gradually or have a sudden onset.
Many exhibit the onset of traits that evolution would magnify in later species.
Amazingly, the bogus injection relieved the soldier's agony and prevented the
  onset of shock.
Even the onset of recession has not reversed that downward trend so far.
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