the act of disjoining or the state of being disjoined: a disjunction between thought and action.
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 AND or V.

1350–1400; Middle English disjunccioun < Latin disjunctiōn- (stem of disjunctiō) separation, equivalent to disjunct(us) (see disjunct) + -iōn- -ion

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World English Dictionary
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
3.  logic
 a.  the operator that forms a compound sentence from two given sentences and corresponds to the English or
 b.  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
 c.  the relation between such sentences

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American Heritage
Medical Dictionary

disjunction dis·junc·tion (dĭs-jŭngk'shən)
The separation of homologous chromosomes during meiosis.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Four factors cause this disjunction between perception and reality.
The salesman's disjunction is revealed by a few phrases and gestures.
Obviously, there's a disjunction between your own life and the characters in this film.
Note the disjunction between the viewers who watched the premier, and those who watched the finale, on the first season.
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