The meaning of PRINCIPLE is a comprehensive and fundamental law, doctrine, or assumption.

There are many principles observed in physics, notably in cosmology which observes the mediocrity principle, the anthropic principle, the principle of relativity and the cosmological principle. Other well …

A principle is a kind of rule, belief, or idea that guides you. You can also say a good, ethical person has a lot of principles.

She doesn't have any principles. He was a man of principle. Anyway, I can't deceive him - it's against all my principles. I never gamble, as a matter of principle (= because I believe it is wrong). She'd never …

Discussing all these details will get us nowhere; we must get back to first principles (= the most basic rules). The court derived a set of principles from this general rule.

The principles of a particular theory or philosophy are its basic rules or laws.

In 'Principles,' investor and entrepreneur Ray Dalio shares his approach to life and management, which he believes anyone can use to make themselves more successful.