principal

Definitions of principal in various dictionaries:

noun - the original amount of a debt on which interest is calculated

noun - the educator who has executive authority for a school

noun - an actor who plays a principal role

noun - capital as contrasted with the income derived from it

noun - (criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement

noun - the major party to a financial transaction at a stock exchange

adj - most important element

First, highest, or foremost in importance, rank, worth, or degree; chief.

Of, relating to, or being financial principal, or a principal in a financial transaction.

One who holds a position of presiding rank, especially the head of an elementary school or high school.

A main participant in a situation.

A person having a leading or starring role.

The capital or main body of an estate or a financial holding as distinguished from the interest or revenue from it.

A sum of money owed as a debt, upon which interest is calculated.

Law.

A person who empowers another to act as his or her representative.

The person having prime responsibility for an obligation as distinguished from one who acts as surety or as an endorser.

One who commits or is an accomplice to a crime.

As an adj ective it has the sense of “chief” or “leading.