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  1. List of conspiracy theories - Wikipedia

    Conspiracy theorists have long posited a plot by organizations such as NASA to conceal the existence of a large planet in the Solar System known as Nibiru or Planet X, which is alleged to pass close …

  2. CONSPIRACY Definition & Meaning - Merriam-Webster

    conspiracy implies a secret agreement among several people usually involving treason or great treachery.

  3. Conspiracy theory | Definition, Examples, & Facts | Britannica

    Jan 19, 2026 · Conspiracy theory, an attempt to explain harmful or tragic events as the result of the actions of a small powerful group. Such explanations reject the accepted narrative surrounding those …

  4. CONSPIRACY | definition in the Cambridge English Dictionary

    CONSPIRACY meaning: 1. the activity of secretly planning with other people to do something bad or illegal: 2. a…. Learn more.

  5. conspiracy noun - Definition, pictures, pronunciation and usage notes ...

    a secret plan by a group of people to do something harmful or illegal. They were charged with conspiracy to murder. He's the sort of person who sees a conspiracy around every corner. I …

  6. CONSPIRACY definition in American English | Collins English Dictionary

    A conspiracy is an agreement between a group of people which other people think is wrong or is likely to be harmful. It's all part of a conspiracy to dispense with the town center altogether and move …

  7. What Are Conspiracy Theories? - Verywell Mind

    Dec 15, 2025 · Learn about the history of conspiracy theories, theories about why we believe in them, and some examples of well-known conspiracy theories.

  8. Conspiracy Theories - The Decision Lab

    Conspiracy theories are beliefs that certain events or situations result from hidden, often malicious plots by powerful people or groups.

  9. CONSPIRACY Definition & Meaning | Dictionary.com

    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 …

  10. In Today’s Conspiracy Theories, the Lack of Evidence Is the Evidence

    Mar 4, 2026 · The conspiracy theories of our time seem fixated on an absence of clues. By Peter C. Baker In Nick Shirley’s mega-viral YouTube videos alleging social-services fraud in Minnesota, the …