monopoly

noun

mo·​nop·​o·​ly mə-ˈnä-p(ə-)lē 

plural monopolies

1

: exclusive ownership through legal privilege, command of supply, or concerted action

specifically : exclusive control of a particular market that is marked by the power to control prices and exclude competition

2

: exclusive possession or control

No country has a monopoly on morality or truth.

—Helen M. Lynd

3

: a commodity controlled by one party

… had a monopoly on flint from their quarries …

—Barbara A. Leitch

4

: one that has a monopoly

The government passed laws intended to break up monopolies.

Did you know?

You're probably familiar with the word monopoly, but you may not recognize its conceptual and linguistic relative, the much rarer oligopsony. Both monopoly and oligopsony are ultimately from Greek, although monopoly passed through Latin before being adopted into English. Monopoly comes from the Greek prefix mono-, which means "one," and pōlein, "to sell." Oligopsony derives from the combining form olig-, meaning "few," and the Greek noun opsōnia—"the purchase of victuals"—which is ultimately from the combination of opson, "food," and ōneisthai, "to buy." It makes sense, then, that oligopsony refers to a buyer's market in which the seller is subjected to the potential demands of a limited pool of buyers. Another related word is monopsony, used for a more extreme oligopsony in which there is only a single buyer.

Examples of monopoly in a Sentence

The government passed laws intended to break up monopolies.

Recent Examples on the Web

The Federal Trade Commission and 17 states sued Amazon in 2023, accusing it of wielding its monopoly power to squeeze merchants, resulting in higher prices on rival websites. —Annie Palmer, CNBC, 20 Apr. 2026

On Wednesday, a New York federal jury found that Live Nation and Ticketmaster illegally operated as a monopoly and overcharged fans. —Alli Rosenbloom, CNN Money, 19 Apr. 2026

The attorneys general, all Democrats, and DirecTV contend the merger will lead to higher prices for consumers, stifle local journalism and that the deal runs afoul of federal laws designed to protect against monopolies. —CBS News, 17 Apr. 2026

Helios, which previously had a monopoly on the Moon's resources, loses an antitrust lawsuit to Exxon, Shell, and Halliburton. —Richard Edwards, Space.com, 17 Apr. 2026

Word History

Etymology

Latin monopolium, from Greek monopōlion, from mon- + pōlein to sell

First Known Use

1534, in the meaning defined at sense 1

Phrases Containing monopoly

• anti-monopoly

Rhymes for monopoly

• antimonopoly
• oligopoly
• trichinopoly

Kids Definition

monopoly

noun

mo·​nop·​o·​ly mə-ˈnäp-(ə-)lē 

plural monopolies

1

a

: complete control over the entire supply of goods or a service in a certain market

b

: complete possession

2

: a commercial product or service controlled by one person or company

3

: a company that has a monopoly

Legal Definition

monopoly

noun

mo·​nop·​o·​ly mə-ˈnä-pə-lē 

plural monopolies

1

: exclusive control of a particular market that is marked by the power to control prices and exclude competition and that especially is developed willfully rather than as the result of superior products or skill see also antitrust, Sherman Antitrust Act

2

: one that has a monopoly