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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 ?
The outright rejection of bivalence by fuzzy logicians constitutes a redefinition of the concept of difference: rather than perceiving difference as the finite space--the slash mark--between two truth values (true/false, is/is not, 0/1), Zadeh proposed difference as a trajectory of change spanning an infinite and infinitely divisible spectrum of truths.
(2016) it becomes clear that certain plants can absorb zinc and iron rather than copper because these elements possess several ionic carriers in common as they have similar chemical properties (ionic radius, bivalence, etc.).
The language of bivalence, the rational/irrational, necessary/contingent, stable/precarious, core/peripheral, harnessed in the master/slave mentality, exhibits itself predominantly in the scientific-technological disembodied gazing and the desire to control everything.
Of course, it is also the case that quietism is not committed to bivalence.
1, the bivalence center ion Cu2+ is five-coordinate through four N atoms from two bidentate chelating Dione [Cu-N1 = 2.02(2) A, Cu-N2 = 2.08(2) A, Cu-N3 = 1.99(2) A, Cu-N4 = 2.08(3) A] and one O atom from water molecule[Cu-OW = 2.05(3) A].
However, these two different modifications of histone H3, which have opposite functions, may be present in the same promoter, referred to as bivalence [29].
A meeting I attended in 2005 entitled 'Islam, Women and Development' exemplified this bivalence. Although organized by a secular political party, the Rassemblement du Peuple led by Baye's son Mamoune Niasse, the meeting featured religious speeches by Fayda leaders (Hill 2011).
Unlike Agamben, Derrida does not conceive of history as the outcome of the Kojevian man-animal bivalence, and certainly does not think of it as concluded:
Madry, Legal Indeterminacy and the Bivalence of Legal Truth, 82 Marquette L.
In the first section, he develops an interpretation of the truth of sentences as based ontologically in the deeper underlying sense of the being of entities and formally-logically in the logical structure of language, and in the second part, he considers the ontological and temporal implications of this formal structure in terms of ontological realism predicated on the maintenance of bivalence, or the requirement that each statement be either true or false or both, with respect to ontological and temporal claims, leading to a realist and paradoxical account of the ontological basis of time as experienced and thought.