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Meaning of upheaval

up•heav•al

Pronunciation: (up-hē'vul), [key]
— n.
  1. strong or violent change or disturbance, as in a society: the upheaval of war.
  2. an act of upheaving, esp. of a part of the earth's crust.
  3. the state of being upheaved.
  4. an upward warping of a part of the earth's crust, forcing certain areas into a relatively higher position than before.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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