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n. pl. e·quiv·a·len·cies
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.
(Chemistry) chem the state of having equal valencies
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
e•quiv•a•lence(ɪˈkwɪv ə ləns or, for 3, ˌi kwəˈveɪ ləns)
1. the state or fact of being equivalent; equality in value, force, significance, etc.
2. an instance of this; an equivalent.
3. the state of having equal chemical valence.
a. the relation between two propositions such that they are either both true or both false.
b. the relation between two propositions such that each logically implies the other.
5. (of a logical or mathematical relationship) reflexive, symmetrical, and transitive.
[1535–45; < Middle French < Medieval Latin]
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