[af-ter-shok, ahf-]
a small earthquake or tremor that follows a major earthquake.
the effect, result, or repercussion of an event; aftermath; consequence: The aftershock of the bankruptcy was felt throughout the financial community.

1890–95; after + shock1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aftershock (ˈɑːftəˌʃɒk)
Compare foreshock one of a series of minor tremors occurring after the main shock of an earthquake

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1804, from after + shock.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
aftershock   (āf'tər-shŏk')  Pronunciation Key 
A less powerful earthquake that follows a more forceful one. Aftershocks usually originate at or near the focus of the main earthquakes they follow and can continue for days or months. They usually decrease in magnitude and frequency with time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Even people whose homes remained whole chose to sleep outside, lest they be
  caught in another aftershock.
These maps graphically illustrate the change in earthquake probability during
  aftershock and possible foreshock sequences.
From this rate, the probability of an aftershock can be determined.
In studying these phenomena, aftershock waveform recordings can play an
  important role.
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