from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The process of being heaved upward.
- n. An instance of being so heaved.
- n. A sudden, violent disruption or upset: "the psychic upheaval caused by war” ( Wallace Fowlie).
- n. Geology A raising of a part of the earth's crust.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the process of being heaved upward, especially the raising of part of the earth's crust
- n. a sudden violent upset, disruption or convulsion
from the GNU version of the Collaborative International Dictionary of English
- n. The act of upheaving, or the state of being upheaved; esp., an elevation of a portion of the earth's crust.
from The Century Dictionary and Cyclopedia
- n. The act of upheaving, or the state of being upheaved; a heaving or lifting up; specifically, in geology, a disturbance of a part of the earth's crust, having as one of its results that certain areas occupy a higher position with reference to adjacent areas than they did before the disturbance took place.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a violent disturbance
- n. disturbance usually in protest
- n. a state of violent disturbance and disorder (as in politics or social conditions generally)
- n. (geology) a rise of land to a higher elevation (as in the process of mountain building)
From upheave + -al. (Wiktionary)