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The Collaborative International Dictionary
Demigrate

Demigrate \Dem"i*grate\, v. i. [L. demigrare, demigratum, to emigrate. See De-, and Migrate.] To emigrate. [Obs.]
--Cockeram.

Wiktionary
demigrate

Etymology 1 vb. (context obsolete English) To emigrate. Etymology 2

vb. To cancel or return from migration (of e.g. a computer system).