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

  • n. The act of disjoining or the condition of being disjointed.
  • n. Logic A proposition that presents two or more alternative terms, with the assertion that only one is true.
  • n. Logic A proposition that presents two or more alternative terms, with the assertion that at least one is true.
  • n. Genetics The separation of homologous chromosomes during meiosis.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. The act of disjoining, or the state of being disjoined; separation; division; distinction.
  • n. Specifically In logic, the relation between the members of a disjunctive proposition or term.
  • n. In logic: a term consisting of two or more terms united by the conjunction or or its equivalent.
  • n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. state of being disconnected
  • n. the act of breaking a connection


Sorry, no etymologies found.


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


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

    By Request: Reasoning

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

    The Book of The Thousand Nights And A Night

  • 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.


  • 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:

  • 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

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


  • (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

  • 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

  • For starters, “Bachelors are unmarried or the moon is blue” is a logical consequence of “Bachelors are unmarried” ” its denial contradicts the latter (a denial of a disjunction is a denial of each disjunct) ” but clearly nothing about the color of the moon is remotely “contained in” the concept bachelor.

    The Analytic/Synthetic Distinction


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