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The Collaborative International Dictionary
Demission

Demission \De*mis"sion\, n. [L. demissio, fr. demittere. See Demit.]

  1. The act of demitting, or the state of being demitted; a letting down; a lowering; dejection. ``Demission of mind.''
    --Hammond.

    Demission of sovereign authority.
    --L'Estrange.

  2. Resignation of an office. [Scot.]

Douglas Harper's Etymology Dictionary
demission

1570s, from French démission, from Latin demissionem "a sending away," noun of action from past participle stem of demittere (see demit).

Wiktionary
demission

n. (context archaic English) resignation; abdication.