demission
Resignation; abdication.
archaic
And that this demission of our royal authority may have the more full and solemn effect, and none pretend ignorance, we give [our cousins authority] ... in our name and behalf, publicly, and in their presence, to renounce the Crown, guidance, and government of this our kingdom of Scotland.
Where it comes from
From French démission, from Latin dēmissiō, from dēmittō.
Adapted from the Wiktionary entry demission (CC BY-SA 4.0).