disjunctions

disjunction

[dis-juhngk-shuhn]
noun
1.
the act of disjoining or the state of being disjoined: a disjunction between thought and action.
2.
Logic.
a.
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.
b.
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.
c.
the relation among the components of such a proposition, usually expressed by AND or V.

Origin:
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)
 
n
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)
n.
The separation of homologous chromosomes during meiosis.

The American Heritage® Stedman's Medical Dictionary
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