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principle

fundamental truth / moral rule / scientific law

/ˈpɹɪnsəpəl/

[C] Countable
pl: principles

A principle is an unchanging anchor. Whether it is a moral code, a scientific law, or a logical axiom, it represents the 'first' or most basic truth from which everything else follows. In a moral context, it carries a heavy sense of integrity and rigidity. When someone acts "on principle," they are prioritizing a conceptual rule over personal convenience or emotion. This often contrasts with "pragmatism," where one might compromise a principle to achieve a practical result. In scientific or technical contexts, it is the underlying mechanism. It describes the 'how' and 'why' of a process rather than just the observation of the result. While a 'rule' tells you what to do, a 'principle' explains why that rule exists.

💬Casual Conversation

🎬Tuesday afternoon, Ryan is gaming while Jackson tries to convince him to invest in a new token.
Jackson

Bro, just ape into this coin. It's based on the principle of decentralized scarcity.

Jackson
Ryan
Ryan

bet

💡
Jackson uses 'principle' to sound intellectually sophisticated while pitching a crypto scam. He uses the slang term 'ape into,' which means to invest heavily and impulsively in a cryptocurrency without doing proper research. Ryan's one-word response 'bet' shows his oblivious nature and casual agreement.

Meanings

Nounfundamental truth

A fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning.

"The company was founded on the principle of absolute transparency."

Nounmoral rule

A rule or standard of conduct based on idealizations of right and wrong.

"He refused to lie, as it was against his principles."

Nounscientific law

A scientific law or a general rule describing how something works.

"Archimedes' principle explains why ships float on water."

Collocations & Compounds

guiding principle

Noun collocation: a primary rule that directs a person's behavior or a project's direction

The guiding principle of the organization is to prioritize sustainability over profit.

basic principle

Noun collocation: a fundamental truth or a simple rule that forms the basis of a system

Understanding the basic principle of supply and demand is essential for any economics student.

moral principle

Noun collocation: a standard of behavior regarding right and wrong

She refused to take the bribe because it violated her deepest moral principle.

scientific principle

Noun collocation: a law of nature or a general rule describing a physical phenomenon

The scientific principle of inertia explains why passengers jerk forward when a car stops suddenly.

adhere to a principle

Verb collocation: to follow or remain loyal to a specific rule or belief

The judge vowed to adhere to the principle of impartiality throughout the trial.

Etymology

Derived from the Latin word principium, meaning a beginning, first part, or foundation, which is formed from primus meaning first and capere meaning to take. It entered Middle English via the Old French principal, evolving from a term describing a starting point to one denoting a fundamental law or a guiding moral code.

Related Words

Last Updated: June 8, 2026Report an Error