Source : Webster's Revised Unabridged Dictionary (1913)

Hanoverian \Han`o*ve"ri*an\, a.
   Of or pertaining to Hanover or its people, or to the House of
   Hanover in England.

Hanoverian \Han`o*ve"ri*an\, n.
   A native or naturalized inhabitant of Hanover; one of the
   House of Hanover.

Source : WordNet®

Hanoverian
     n 1: any of the British sovereigns belonging to the House of
          Hanover
     2: a member (or supporter) of the house of Hanover

Hanoverian
     adj : of or relating to the former English royal House of Hanover
           or their supporters