Vicegerent

Word often mistakenly written viceregent, since gerent is unfamiliar, but both vice meaning 'deputy' and regent meaning 'deputy (for a monarch)' are familiar. But of course viceregent would mean a kind of deputy for a deputy, a sense virtually never required. So it's almost certainly meant to be the now unfamiliar word vicegerent.

Vice*ge"rent (?), a. [Vice, a. + gerent: cf. F. vicegérant.]

Having or exercising delegated power; acting by substitution, or in the place of another. Milton.

© Webster 1913

Vice*ge"rent (?), a. [Vice, a. + gerent: cf. F. vicegérant.]

Having or exercising delegated power; acting by substitution, or in the place of another. Milton.

© Webster 1913

Vice*ge"rent, n.

An officer who is deputed by a superior, or by proper authority, to exercise the powers of another; a lieutenant; a vicar. Bacon.

The symbol and vicegerent of the Deity.
C. A. Young.

© Webster 1913