Critical Thinking

Equivocation

Properties1
tagslogical-fallacies

1 min read

Equivocation

Using a word or phrase with multiple meanings in different parts of an argument, as if it means the same thing throughout. The argument appears valid because the same word is used, but the meaning shifts.

Examples

  • “Only man is rational. No woman is a man. Therefore no woman is rational.” (Shifts “man” from “human” to “male”)
  • “The sign says ‘Fine for parking here.’ Since it’s fine, I’ll park here.” (Shifts “fine” from “penalty” to “acceptable”)
  • “Evolution is just a theory. Theories are just guesses. So evolution is just a guess.” (Shifts “theory” from “scientific explanation” to “hunch”)
  • “You have faith in science. I have faith in religion. They’re the same.” (Shifts “faith” from “trust based on evidence” to “belief without evidence”)

Why It Works

  • Exploits natural language ambiguity
  • Feels like wordplay rather than logical error
  • Can be subtle — the shift happens between premises

How to Counter

  • “You’re using that word in two different senses. Define it precisely.”
  • “Let’s taboo that word and restate the argument with clear definitions.”
  • “In premise 1 you mean X; in premise 2 you mean Y. Those aren’t the same.”

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