Distinguishing Between “Principle” and “Principal”: A Simple Guide

Understanding the Difference Between Principle and Principal

The words “principle” and “principal” sound alike, but they mean different things. Let’s learn about each and how to use them correctly.

History of the Words

Principle: This word comes from the Latin word “principium,” which means “beginning” or “foundation.” It refers to basic beliefs or rules.

Principal: This word comes from the Latin word “principalis,” meaning “first” or “chief.” It is used for people in charge or main parts of something.

How to Use Them

Principle

“Principle” is a noun. It talks about a truth, rule, or belief.

• It is important to have strong principles.
• Honesty is a principle I live by.
• She taught the principles of math to the class.
• Equality is a key principle of our society.
• Do you understand the principle behind this machine?

Principal

“Principal” can be a noun or an adjective.

As a noun, it refers to a person in charge, like a school leader.

• The school principal is very kind.
• The principal made an announcement today.
• I asked the principal for advice.
• The principal of the company is from New York.
• We met the principal during the school tour.

As an adjective, it means “main” or “most important.”

• The principal reason for the meeting is to plan the event.
• Sugar is the principal ingredient in this recipe.
• Her principal concern is the safety of the children.
• The principal aim of the project is to help the environment.
• He is the principal player on the team.

Trick to Remember the Difference

Remember: Principle is like a “rule” or “belief” (both have an “e” and focus on ideas). Principal ends with “pal,” and a school principal can be your “friend” or “pal” (focus on people).

Summary

Use principle when talking about rules or beliefs, and use principal when talking about the main person in charge or the most important thing.