aristocracy: "The exercise of political power by a small ruling clique of a state's "best" citizens.  The selection of the aristocrats may be made on the basis of birth, wealth, or ability, or economic, social, or ecclesiastical position.  For Aristotle, aristocracy meant rule by the most virtuous, but in medieval Europe it came to mean rule by the upper classes, whom God had appointed to rule....Aristocracies are characterized by limited suffrage and great emphasis on property rights.  Postrevolutionary America had characteristics of aristocracy, with property and religious qualifications for voting and holding office".

from:  Plano and Greenberg,  The American Political Dictionary