The Collaborative International Dictionary of English v.0.48:
Oligarchic \Ol`i*gar"chic\, Oligarchical \Ol`i*gar"chic*al\, a. [Gr. ?: cf. F. oligarchique. See Oligarchy.] Of or pertaining to oligarchy, or government by a few. "Oligarchical exiles." --Jowett (Thucyd.). [1913 Webster]WordNet (r) 3.0 (2006):
oligarchic adj 1: of or relating to or supporting or characteristic of an oligarchy [syn: oligarchic, oligarchical]