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United States antitrust law. United States antitrust law is a collection of federal and state government laws that regulates the conduct and organization of business corporations, generally to promote fair competition for the benefit of consumers.
Full Definition of ANTITRUST. : of, relating to, or being legislation against or opposition to trusts or combinations; specifically: consisting of laws to protect trade and commerce from unlawful restraints and monopolies or unfair business practices.See antitrust defined for English-language learners. of, relating to, or being legislation against or opposition to trusts or combinations; specifically: consisting of laws to protect trade and commerce from unlawful restraints and monopolies or unfair business practices.