A member of an oligarchy; someone who is part of a small group that runs a country.
A very wealthy business owner who wields political power.
A protoplanet formed during oligarchic accretion.
A ruler of other rulers.
A feudal lord directly owed rent or personal service by a tenant of subinfeudated land, a tenant's liege lord.
Anyone with overarching power or authority in a given domain.
To rule over; to domineer.