Origin: Latin suffix -al
Principal has 9 different meanings across 2 categories:
the original amount of a debt on which interest is calculated
"After paying down some of his loan, he realized that the principal balance was still higher than he expected because only part of his payment went toward reducing it."
the educator who has executive authority for a school
"she sent unruly pupils to see the principal"
capital as contrasted with the income derived from it
"The bank agreed to let us pay off a portion of our principal every month to reduce the total interest we owe over time."
(criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement
"The jury found that three accomplices and the principal were all guilty of the bank robbery, even though only the leader had taken the money."
The money originally invested or loaned, on which basis interest and returns are calculated.
"When comparing investment options, she focused on how much of her principal would remain intact rather than just the potential annual yield."
In plain English: A principal is the main person in charge of a school who makes important decisions and manages the staff.
"The principal met with the parents to discuss the student's grades."
Usage: As a noun, principal refers to the original sum of money invested or borrowed before any interest is added. Use this term specifically when discussing financial amounts that serve as the base for calculating interest or returns.
Primary; most important; first level in importance.
"The principal reason we canceled the event was the severe weather warning issued by meteorologists."
In plain English: Principal means being the main or most important thing in a group.
"The principal reason for our delay was the heavy traffic."
Usage: Use "principal" as an adjective to describe something that is primary or most important, such as the principal reason for a decision. Do not confuse it with "principle," which is always a noun referring to a fundamental truth or rule.
The word entered English via Middle English and Old French from the Latin prīncipālis. It originally meant "first" or "chief," reflecting its root in words related to a prince or leader.