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1. Genetics Relating to or being a pair of homologous, side-by-side chromosomes, especially during meiosis; double.
2. Chemistry & Immunology Divalent.

bi·va′lence, bi·va′len·cy n.
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.


(baɪˈveɪləns; ˈbɪvə-)
(Logic) logic philosophy the semantic principle that there are exactly two truth values, so that every meaningful statement is either true or false. Compare many-valued logic
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Francesco Ademollo 'The Principle of Bivalence in De interpretatione 4'
(6) Most commonly, the assumption rejected is that every proposition must either be true or be false, an assumption called the principle of bivalence. But if propositions are not bivalent, so that both P and not P can be true and false to a degree, then one can show that sometimes P equals not P--which is a rather disquieting contradiction.
They give more detailed analyses to topics such as Husserl's view of geometry, his account of the paradoxes, completeness, axiomatization, sets and manifolds, and the principle of bivalence. One chapter collects together what is known about Frege's correspondence with various mathematicians.
Theorists of vagueness often reject the principle of bivalence - every statement has one of two truth values - which they distinguish from the law of excluded middle - every disjunction of a statement with its negation is true.
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