An example of principal is the person in charge at a school or the head of a research project.
An example of principal is the amount of money loaned to a business.
- A chief; head.
- A governing or presiding officer, specif. of a school.
- A main actor or performer.
- Either of the combatants in a duel.
Smith is the principal architect of this design.
The principal cause of the failure was poor planning.
A portion of your mortgage payment goes to reduce the principal, and the rest covers interest.
When an attorney represents a client, the client is the principal who permits the attorney, the client"²s agent, to act on the client"²s behalf.
My principal sells metal shims.
An example of a principal ingredient is flour in bread.