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• common law
  common law

  noun

  the system of law originating in England, as distinct from the civil or Roman law and the canon or ecclesiastical law.
• common-law
  common-law

  adjective

  of, relating to, or established by common law.

common law

¹ American  

[kom-uhn law] / ˈkɒm ən ˈlɔ /

noun

common laws plural

1. the system of law originating in England, as distinct from the civil or Roman law and the canon or ecclesiastical law.

2. the unwritten law, especially of England, based on custom or court decision, as distinct from statute law.

3. the law administered through the system of courts established for the purpose, as distinct from equity or admiralty.

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common-law ² American  

[kom-uhn-law] / ˈkɒm ənˈlɔ /

adjective

1. of, relating to, or established by common law.

   a common-law spouse.

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common law British  

noun

1. the body of law based on judicial decisions and custom, as distinct from statute law

2. the law of a state that is of general application, as distinct from regional customs

3.  common-law.  (modifier) denoting a marriage deemed to exist after a couple have cohabited for several years

   common-law marriage

   common-law wife

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common law Cultural  

1. Law developed in the course of time from the rulings of judges, as opposed to law embodied in statutes passed by legislatures (statutory law) or law embodied in a written constitution (constitutional law). (See stare decisis.)

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The importance of common law is particularly stressed in the legal system of Britain, on which the legal system of the United States is based.

Other Word Forms

Noun Inflected Forms

• common laws
  plural

Etymology

Origin of common law¹

Middle English word dating back to 1300–50

Origin of common-law²

First recorded in 1905–10

Example Sentences

See Examples For:

common law common-law

It’s true that our common law and constitutional precedents have long protected parents’ relationship with their children—and in our view, with good reason.

From Slate ● Mar. 12, 2026

Misconduct in Public Office is part of England's "common law" - which means judges came up with it hundreds of years ago, rather than Parliament.

From BBC ● Feb. 20, 2026

In the modern era, the British heritage of common law, freedom of speech and personal virtue didn’t constrain innovation but produced it.

From The Wall Street Journal ● Jan. 2, 2026

Under common law, liability for “aiding and abetting” is reserved for parties that consciously induce or assist wrongdoing.

From The Wall Street Journal ● Nov. 27, 2025

The English had the common law, which relied on the jury system.

From "The Invention of Science" by David Wootton

The majority’s decision in Barbara recounts how before the 14th Amendment’s ratification, Americans followed the long-standing common-law rule making persons born on American soil citizens by birth.

From Slate ● Jul. 24, 2026

Many people wrongly believe co-habiting couples have automatic legal and inheritance rights under "common-law marriage", says Alastair Sinclair, family lawyer at Setfords.

From BBC ● Jul. 4, 2026

She then was transferred to Pretrial Detention Centre Number 5 in Donetsk, where she shared a small, filthy cell with around 20 common-law prisoners.

From Barron's ● May 8, 2026

But, it added, it never gave up plans to use it and retains common-law rights.

From The Wall Street Journal ● Dec. 25, 2025

Most of these men were common-law prisoners, but I knew diere would be some political prisoners among them.

From "Long Walk to Freedom" by Nelson Mandela