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ARTICLE · 28 MAY 2026

Glossary Of Key Antitrust Terms

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If you are an executive or general counsel of any business, whether a startup or Fortune 100, you will at some point hire and interact with outside antitrust counsel.

United StatesAntitrust/Competition Law
Aaron Gott
Aaron Gott

If you are an executive or general counsel of any business, whether a startup or Fortune 100, you will at some point hire and interact with outside antitrust counsel. This glossary is your guide to dealing with them. It explains essential terms and concepts in U.S. federal antitrust and competition law. Each entry provides a brief, plain-language explanation with corporate legal decisionmakers in mind as the audience with links to more detailed discussions on The Antitrust Attorney Blog and the Bona Law website for readers who want to dive deeper. We focus on U.S. antitrust principles, with a few notes on international standards where relevant. 

Market Structure & Power

Relevant Market

The relevant market defines the boundaries within which competition is evaluated. It includes a product market (substitutable goods) and a geographic market (where competition occurs). Market definition is central to assessing market power and competitive effects in merger and conduct cases.

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The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

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