Principal

1. One of turrets or pinnacles of waxwork and tapers with which the posts and center of a funeral hearse were formerly crowned.
2. One who employs another to act for him, -- as distinguished from an agent.
3. The first two long feathers of a hawk's wing.
4. A principal or essential point or rule; a principle.
5. A capital sum of money, placed out at interest, due as a debt or used as a fund; -- so called in distinction from interest or profit.
6. A leader, chief, or head; one who takes the lead; one who acts independently, or who has controlling authority or influence; as, the principal of a faction, a school, a firm, etc.; -- distinguished from a subordinate, abettor, auxiliary, or assistant.
7. In English organs the chief open metallic stop, an octave above the open diapason. On the manual it is four feet long, on the pedal eight feet. In Germany this term corresponds to the English open diapason.
8. The chief actor in a crime, or an abettor who is present at it, -- as distinguished from an accessory.
9. Highest in rank, authority, character, importance, or degree; most considerable or important; chief; main; as, the principal officers of a Government; the principal men of a state; the principal productions of a country; the principal arguments in a case.
10. The construction which gives shape and strength to a roof, -- generally a truss of timber or iron, but there are roofs with stone principals. Also, loosely, the most important member of a piece of framing.
11. A heirloom; a mortuary.
12. A thing of chief or prime importance; something fundamental or especially conspicuous.
13. A chief obligor, promisor, or debtor, -- as distinguished from a surety.