Definitions
1.nounThe early period of the Roman Empire, during which some characteristics of the government of the Roman Republic were retained; the reign of any particular emperor during said period.
2.nounThe office of one who is principal or preeminent (such as a prince); the quality or status of being principal; preeminence.
3.nounA state ruled by a prince; a principality.
4.adjectivePrimary; principal.