from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The act of disjoining or the condition of being disjointed.
  • noun Genetics The separation of homologous chromosomes during meiosis.

from The Century Dictionary.

  • noun The act of disjoining, or the state of being disjoined; separation; division; distinction.
  • noun Specifically In logic, the relation between the members of a disjunctive proposition or term.
  • noun In logic: a term consisting of two or more terms united by the conjunction or or its equivalent.
  • noun In biology, the separation or alternative inheritance of the parental characters in crosses between inbred varieties or strains of domesticated plants and animals. Called also the law of disjunction, or Mendel's law. See inheritance.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The act of disjoining; disunion; separation; a parting.
  • noun A disjunctive proposition.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun act of disjoining; disunion, separation
  • noun state of being disjoined
  • noun logic The proposition resulting from the combination of two or more propositions using the or operator.
  • noun mathematics a logical operator that results in true when some of its operands are true.
  • noun biology During meiosis, the separation of chromosomes (homologous in meiosis I, and sister chromatids in meiosis II).

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

  • noun state of being disconnected
  • noun the act of breaking a connection


Sorry, no etymologies found.


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  • But nowadays the term disjunction is more often used in reference to sentences (or well-formed formulae) of associated form occurring in formal languages.

    Disjunction Jennings, Ray 2008

  • This study demonstrates a violation of the rule in a context that justifies the label disjunction fallacy.

    By Request: Reasoning Chris 2004

  • This study demonstrates a violation of the rule in a context that justifies the label disjunction fallacy.

    Archive 2004-12-01 Chris 2004

  • And my heart with the fires of disjunction is fried:

    The Book of The Thousand Nights And A Night 2006

  • The Latin word "vel" expresses weak or inclusive disjunction, and the Latin word "aut" corresponds to the word "or" in its strong or exclusive sense.

    Disjunction Jennings, Ray 2008

  • While I think that allowing the disjunction is the easiest fix, I suspect that the heart of the problem is in the definition of offenses.

    The Volokh Conspiracy » The Strange Practice of Indicting in the Conjunctive: 2009

  • As a first approximation, then, moral anti-realism can be identified as the disjunction of three theses: moral noncognivitism moral error theory moral subjectivism

    Moral Anti-Realism Joyce, Richard 2007

  • Can it be that the disjunction is a final one? that only one side can be true?

    Pragmatism William James 1876

  • (possibly but not necessarily described as a disjunction of concepts); or they could be subordinated to a single concept which represents in a prior and a posterior manner (per prius et posterius).

    Medieval Theories of Analogy Ashworth, E. Jennifer 2009

  • Cat's stories create a similar kind of disjunction when they recast slavery and eugenics in a fantasy setting.

    MIND MELD: More Nebula-Worthy Works of Fiction...Picked By Some of This Year's Nebula Nominees 2010


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