What does antitrust mean?
Antitrust is an adjective describing laws, policies, and enforcement actions aimed at preventing monopolies and preserving competitive markets. The term originated in late nineteenth-century America, when powerful corporate combinations known as trusts dominated entire industries and prompted public outrage over inflated prices and stifled competition. Landmark statutes such as the Sherman Antitrust Act of 1890 gave the word its enduring legal meaning, and it remains central to debates over mergers, big tech companies, and consumer welfare. In modern usage, antitrust appears almost exclusively before another noun — as in 'antitrust laws,' 'antitrust case,' or 'antitrust regulator' — and carries a formal, legal register. While most closely associated with United States jurisprudence, the concept it denotes, often called competition law elsewhere, is recognized worldwide. Understanding antitrust means understanding how governments balance the power of large corporations against the interests of consumers and smaller competitors.
adjectiveRelating to laws and policies designed to prevent monopolies and promote fair competition in the marketplace.
- (Of laws, regulations, or policies) Opposing or preventing monopolies and restraints of trade to protect market competition.
"The company was broken up after a landmark antitrust case in the 1980s."
"Regulators filed an antitrust lawsuit alleging that the merger would stifle competition."
"She teaches a seminar on antitrust economics at the law school."
The word 'antitrust' dates back to the Gilded Age, when robber barons formed giant business 'trusts' so powerful that the US government had to invent an entirely new kind of law to break them up.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of antitrust
The word antitrust combines the prefix 'anti-' (from Greek, meaning against) with 'trust,' which entered English from Old Norse 'traust' meaning confidence or protection. It arose in the United States during the 1880s and 1890s, when industrialists formed vast business combinations legally structured as trusts to control entire industries. Public backlash against these conglomerates produced the Sherman Antitrust Act of 1890, cementing the word in American legal vocabulary. Related forms sharing the 'trust' root include distrust, entrust, and trustworthy.
How antitrust is actually used
Antitrust functions almost exclusively as an attributive adjective modifying nouns such as laws, cases, regulators, and policy. It carries a formal, legal register. The term is most strongly associated with American law (notably the Sherman Antitrust Act of 1890); other jurisdictions use terms like 'competition law' for the same concept, though 'antitrust' is widely understood internationally.
Easily confused with antitrust
"Trust" means confidence in someone's reliability, while "antitrust" refers to laws opposing monopolistic business combinations historically called trusts.