Of or relating to a prince; princely.
But walkt at will, and wandred to and fro, / In the pride of his freedome principall.
Chosen or assumed among a branch of possible values of a multi-valued function so that the function is single-valued.
Two is the principal square root of 4. Both −2 and +2 are square roots of 4.
The money originally invested or loaned, on which basis interest and returns are calculated.
A portion of your mortgage payment goes to reduce the principal, and the rest covers interest.
The chief administrator of a school.
The important administrative figure to the teacher is the school principal.
From Middle English principal, from Old French principal, from Latin prīncipālis.
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The chief executive and chief academic officer of a university or college.
1967, University of Edinburgh Graduates′ Association, University of Edinburgh Journal, Volumes 23-24, page 314, Unlike the students, Principal Robertson, who now resided almost alone in the College, continued to use the accustomed route on his visits to the Old Town; and it “became the joke of the day that from being the principal gate it had become only a gate for the Principal.”⁵