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Having equal force or strength.
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.
1. having equal force or strength
2. (Physical Geography) of or relating to an imaginary line on the earth's surface connecting points of equal horizontal magnetic intensity
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
i•so•dy•nam•ic(ˌaɪ soʊ daɪˈnæm ɪk)
pertaining to or having equality of force, intensity, or the like.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.