Etymology
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disjunction (n.)

c. 1400, disjunccioun, "fracture" (of a bone), from Old French disjunction (13c.) and directly from Latin disiunctionem (nominative disiunctio) "separation," noun of action from past-participle stem of disiungere, from dis- (see dis-) + iungere "to join together," from nasalized form of PIE root *yeug- "to join." 

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Definitions of disjunction

disjunction (n.)
state of being disconnected;
Synonyms: disjuncture / disconnection / disconnectedness
disjunction (n.)
the act of breaking a connection;
Synonyms: disconnection
From wordnet.princeton.edu