[ dis-juhngk-shuhn ]
See synonyms for disjunction on Thesaurus.com
  1. the act of disjoining or the state of being disjoined: a disjunction between thought and action.

  2. Logic.

    • Also called disjunctive, inclusive disjunction. a compound proposition that is true if and only if at least one of a number of alternatives is true.

    • Also called exclusive disjunction. a compound proposition that is true if and only if one and only one of a number of alternatives is true.

    • the relation among the components of such a proposition, usually expressed by OR or V.

Origin of disjunction

First recorded in 1350–1400; Middle English disjunccioun from Latin disjunctiōn- (stem of disjunctiō ) “separation,” equivalent to disjunct(us) (see disjunct) + -iōn- -ion

Words Nearby disjunction

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use disjunction in a sentence

  • Aversion between married partners arises from a disunion of souls and a disjunction of minds, 236.

  • For this disjunction from Hellenic life, brought about by war, is not only physical but has become spiritual.

    Homer's Odyssey | Denton J. Snider
  • This closure of nature does not carry with it any metaphysical doctrine of the disjunction of nature and mind.

    The Concept of Nature | Alfred North Whitehead
  • There exists no disjunction between aesthetic qualities which are final yet idle, and acts which are practical or instrumental.

British Dictionary definitions for disjunction


/ (dɪsˈdʒʌŋkʃən) /

  1. Also called: disjuncture the act of disconnecting or the state of being disconnected; separation

  2. cytology the separation of the chromosomes of each homologous pair during the anaphase of meiosis

  1. logic

    • the operator that forms a compound sentence from two given sentences and corresponds to the English or

    • a sentence so formed. Usually written pq where p, q are the component sentences, it is true (inclusive sense) whenever either or both of the latter are true; the exclusive disjunction, for which there is no symbol, is true when either but not both disjuncts is

    • the relation between such sentences

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012