counterexample

/ˈkaʊntərɪɡˌzæmpəl/
noun
  1. An example that disproves a statement, theory, or claim.
    • The lawyer offered a counterexample to the prosecutor's argument.
    • The teacher asked for a counterexample to the rule that all birds can fly.
    • Finding a single counterexample can show that a mathematical conjecture is false.
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