Do you live by principle or principal?

Do you always get confused between ‘principal’ and ‘principle’ while drafting? Here are some guidelines.


This word comes from Old French Principe, from Latin principium

Noun and how it’s used?

  1. An accepted or professed rule of action or conduct

The principle of equality of nations that inhabit our country is strictly adhered by.

  1. a fundamental assumption

We need some sort of principles to reason from.

  1. a fundamental doctrine or tenet; a distinctive ruling opinion

There are principles of natural justice.

  1. a personal or specific basis of conduct or management

I don’t doubt your principles.

  1. A rule or law of nature, or the basic idea on how the laws of nature are applied

The Heisenberg uncertainty principle in quantum mechanics implies that vacuum fluctuations are present in every quantum theory.


This word is derived from Latin prīncipālis which is equivalent to prīncip (prince) + -ālis (kind of)

Adjective and how it’s used?

  1. first or highest in rank,importance,value;chief;foremost

After all she went through; her principal worry was that you were going to beat her with your hairbrush.

  1. Constituting capital

A principal investment

Noun and how it’s used?

  1. A chief or head especially of school or college

We met with the principal who looked it all over.

  1. (Law) One who directs another to act on one′s behalf

When an attorney represents a client, the client is the principal who permits the attorney, the client′s agent, to act on the client′s behalf.

  1. (Law) Primary participant in a crime

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