Etymology
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disunion (n.)

late 15c., "severance of union, disjunction," from dis- + union. Meaning "a breach of amity, contentious disagreement" is from c. 1600. In U.S. history, disunionist (1831) was "one who favors or seeks the disunion of the United States."

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Definitions of disunion

disunion (n.)
the termination or destruction of union;
From wordnet.princeton.edu