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The Collaborative International Dictionary
Sejunction

Sejunction \Se*junc"tion\, n. [L. sejunctio. See Sejoin.] The act of disjoining, or the state of being disjoined. [Obs.]
--Bp. Pearson.

Wiktionary
sejunction

n. (context obsolete English) The act of disjoining, or the state of being disjoined.