The Collaborative International Dictionary of English v.0.48:

Vicegerent \Vice*ge"rent\, a. [Vice, a. + gerent: cf. F.
   vice-g['e]rant.]
   Having or exercising delegated power; acting by substitution,
   or in the place of another. --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vicegerent \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.
   [1913 Webster]

         The symbol and vicegerent of the Deity.  --C. A. Young.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vicegerent
    n 1: someone appointed by a ruler as an administrative deputy