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1. (used with a sing. verb) The branch of dynamics that is concerned with the causes and effects of forces and motions involving the earth's interior, including rotation, plate tectonics, volcanic eruptions, and seismic modeling.
2. (used with a pl. verb) The forces and motions involving the earth's interior.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) (functioning as singular) the branch of geology concerned with the forces and processes, esp large-scale, of the earth's interior, particularly as regards their effects on the crust or lithosphere
ˌgeodyˈnamic, ˌgeodyˈnamical adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the science of the forces at work within the earth. — geodynamic, adj.See also: Earth
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.