from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Chemistry Divalent.
  • adj. Biology Consisting of a pair of homologous, synapsed chromosomes, as occurs during meiosis; double.
  • n. Biology A pair of homologous, synapsed chromosomes associated together during meiosis.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a valence of 2.
  • adj. Of, or relating to a pair of homologous synapsed chromosomes that occur during meiosis.
  • n. Any bivalent chromosome.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Equivalent in combining or displacing power to two atoms of hydrogen; dyad.

from The Century Dictionary and Cyclopedia

  • In chem., applied to an element an atom of which can replace two atoms of hydrogen or other univalent element, or to a radical which has the same valence as a bivalent atom.
  • In cytology, having double as distinguished from single (univalent) chromosomes in the oöcytes and spermatocytes, as in one of the varieties of the roundworm of the horse (Ascaris megalocephala).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. used of homologous chromosomes associated in pairs in synapsis
  • adj. having a valence of two or having two valences


from Wiktionary, Creative Commons Attribution/Share-Alike License

bi- + -valent


  • It is, in one of Sean's favorite expressions, a sport with a "bivalent" storyline, you know, where all the AM sports buffoons say stuff like "It's W's and L's, baby" and "horseshoes and hand grenades," etc.

    luck is the residue of design

  • Its bivalent, meaning it can run on either natural gas or gasoline, but it always starts in gasoline mode. - Business News

  • The research, conducted by a team of scientists led by Giuseppe Testa, Director of the Stem Cell Epigenetics Programme at the Department of Experimental Oncology at IEO, focuses on a particular group of 'bivalent' genes that, during embryonic stem cell differentiation, are either activated or repressed, bestowing stem cells with a neuronal identity


  • Cervarix is bivalent, protecting against two strains of human papillomavirus HPV that can trigger cervical cancer, but Gardasil is quadrivalent, protecting against four.

    Experts urge cervical cancer vaccine switch

  • Majority rules is the normal and obvious way of resolving bivalent “yes or no” questions.

    Matthew Yglesias » Mark Schmitt on the Filibuster

  • In practical terms many of the identifiers that Bakker offers as more relevant identifiers of fantasy ( "the use of innocence (via characterization) as a foil to some apocalyptic threat, the valorization of archaic social interrelationships, the espousal of some bivalent morality, the compositional influence [of] Tolkien") are very much about accessibility in this sense.

    The Aesthetics of Fat

  • Then, if classically this function is bivalent, which can be expressed by saying that Ï (x, y) always takes, say, the value 1 or the value 0 according to whether or not x is part of y, to say that parthood may be indeterminate is to say that Ï need not be fully bivalent.

    Wild Dreams Of Reality, 3

  • Ï (y, x) = 1, then x = y and one could argue that the very same conditions may be taken to fix the basic properties of parthood regardless of whether Ï is bivalent.

    Wild Dreams Of Reality, 3

  • The values of a bivalent quantity, for instance, form a set with two members; the values of a real-valued quantity form a set with the structure of the real numbers.

    Quantum Mechanics

  • The result of these apparent limitations is that Kant's logic is significantly weaker than “elementary” logic (i.e., bivalent first-order propositional and polyadic predicate logic plus identity) and thus cannot be equivalent to a mathematical logic in the Frege-Russell sense, which includes both elementary logic and also quantification over properties, classes, or functions (a.k.a. “second-order logic”).

    Kant's Theory of Judgment


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