conspiracy

American  

[kuhn-spir-uh-see] / kənˈspɪr ə si /

noun

plural

conspiracies

1. the act of conspiring.

   Synonyms:

   sedition, collusion

2. an unlawful, harmful, or evil plan formulated in secret by two or more persons; plot.

3. a combination of persons for such an unlawful, harmful, or evil purpose.

   He joined the conspiracy to overthrow the government.

4. Law. an agreement by two or more persons to commit a crime, fraud, or other wrongful act.

5. any concurrence in action; combination in bringing about a given result.

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conspiracy British  

/ kənˈspɪrəsɪ, kənˌspɪrəˈtɔːrɪəl /

noun

1. a secret plan or agreement to carry out an illegal or harmful act, esp with political motivation; plot

2. the act of making such plans in secret

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Usage

What does conspiracy mean? Conspiracy most commonly means a secret plan by multiple people to do something evil or illegal. Conspiracy can also refer to the act of making such plans—the act of conspiring—or to the group making the plans. The people involved can be called conspirators. In a legal context, conspiracy refers to an agreement by two or more people to commit a crime. A conspiracy theory is an explanation of an event that claims it was the result of a secret and often complex and evil plot by multiple people. People who promote or formulate conspiracy theories often reject the standard or accepted explanation of unexplained or unusual events and claim that they are the doing of evil conspirators secretly conspiring behind the scenes. Both conspiracy and conspiracy theory are often used in the context of politics. Example: This isn’t the work of one man—it’s a conspiracy, and there are more people in on it than you think!

Related Words

Conspiracy, plot, intrigue, cabal all refer to surreptitious or covert schemes to accomplish some end, most often an evil one. A conspiracy usually involves a group entering into a secret agreement to achieve some illicit or harmful objective: a vicious conspiracy to control prices. A plot is a carefully planned secret scheme, usually by a small number of persons, to secure sinister ends: a plot to seize control of a company. An intrigue usually involves duplicity and deceit aimed at achieving either personal advantage or criminal or treasonous objectives: the petty intrigues of civil servants. Cabal refers either to a plan by a small group of highly-placed persons to overthrow or control a government, or to the group of persons themselves: a cabal of powerful lawmakers.

Other Word Forms

• conspirative adjective
• conspirator noun
• conspiratorial adjective
• conspiratorially adverb
• conspiratory adjective
• preconspiracy noun

Etymology

Origin of conspiracy

First recorded in 1325–75; Middle English conspiracie, probably from Anglo-French; conspire, -acy; replacing Middle English conspiracioun; conspiration

Explanation

A conspiracy is a secret agreement between two or more people to commit an unlawful or harmful act. A person who believes that the government is secretly controlled by power brokers, in flagrant violation of the U.S. Constitution, is an example of a conspiracy theorist. Conspiracy can also refer to the act of planning an unlawful or harmful act: Terrorists might be accused of organizing a conspiracy to overthrow the government. Conspiracy is ultimately from Latin cōnspīrāre "to agree or plot together, literally to breathe together." The corresponding English verb is conspire.

Example Sentences

And in late February, jurors convicted two activists on stalking charges after they livestreamed themselves following an immigration agent to his home; the pair were acquitted of conspiracy.

From Salon • Apr. 15, 2026

Agents who searched Orellana’s house found little that could be considered incriminating, and prosecutors never charged anyone else as part of the supposed conspiracy.

From Salon • Apr. 15, 2026

Jade Tubb, Nikolli's partner, of Walsall, also admitted conspiracy to possess criminal property and was handed a 12-month sentence, which was suspended for two years, and ordered to carry out 200 hours of community service.

From BBC • Apr. 14, 2026

Liu and three others were indicted in 2024 on charges of conspiracy, smuggling and violating U.S. laws on trade with Iran.

From The Wall Street Journal • Apr. 11, 2026

Una and her father had a conspiracy about learning—secret books were borrowed and read and their secrets communicated privately.

From "East of Eden" by John Steinbeck

Related Words

• plot
• scheme
• sedition
• treason