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Webster 1913 Edition

Noun.

[L.

sejunctio

. See

The act of disjoining, or the state of being disjoined.

[Obs.]

Bp. Pearson.

Noun.

[l. sejunctio; se, from, and jungo, to join.] The act of disjoining; a disuniting; separation. [Little used.]

sejunction ‎(plural sejunctions)

(obsolete) The act of disjoining, or the state of being disjoined.
- Bishop Pearson
  The constitution of that people was made by a sejunction and separation of them from all other nations on the earth: and this began in Abraham […]
(psychology) An interruption of the continuity of association-complexes which leads to a breaking up of the personality.