As an adjective, principal typically means "most important" ("the principal reason"). The principle of his great success lay in the fact of his appearance at a critical epoch. The North American …

Classically it is considered to be one of the most important fundamental principles or laws of thought (along with the principles of identity, non-contradiction and sufficient reason).

Principle, canon, rule imply something established as a standard or test, for measuring, regulating, or guiding conduct or practice. A principle is a general and fundamental truth that …

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. In general, a principle is some kind of basic truth that helps you …

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 …

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.

Learning Principles Theory and Research-based Principles of Learning The following list presents the basic principles that underlie effective learning. These principles are distilled from research …