Wales / Alternative letter-case form of principality; any of the actual extant principalities.

(countable) A region or sovereign nation headed by a prince or princess.

(historical) The 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.

Primary; principal.

The quality of being principal.

Misspelling of in principle.

In a primary manner; pertaining to the principal of a matter.

Primary; most important; first level in importance. / (obsolete, Latinism) Of or relating to a prince; princely.

(finance, uncountable) The money originally invested or loaned, on which basis interest and returns are calculated. / (Canada, US, Australia, New Zealand) The chief administrator of a school.

plural of principal