Webster's Revised Unabridged Dictionary · 1913

Demit

Demit , transitive verb

[Latin demittere to send or bring down, to lower; de- + mittere to send. Compare Demise.]

1.
To let fall; to depress. [Rare]
They [peacocks] demit and let fall the same [i. e., their train]. — Sir T. Browne
2.
To yield or submit; to humble; to lower; as, to demit one's self to humble duties. [Rare]
3.
To lay down, as an office; to resign. [Scottish]
General Conway demitted his office. — Hume

Demit , intransitive verb

[French démettre to remove, se démettre to resign; dé- (Latin dis-) + mettre to put, from Latin mittere to send. Compare Dismiss.]

To lay down or relinquish an office, membership, authority, or the like; to resign, as from a Masonic lodge; -- generally used with an implication that the act is voluntary.

Demit , noun

The act of demitting; also, a letter, certificate, or the like, certifying that a person has (honorably) demitted, as from a Masonic lodge.