Equivocation
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In logic, equivocation ("calling two different things by the same name") is an informal fallacy resulting in the failure to define one's terms, or knowingly and deliberately using words in a different sense than the one the audience will understand.<ref name="Damer2008">Template:Cite book</ref><ref>Template:Citation</ref><ref>Template:Citation</ref>
It is a type of ambiguity that stems from a phrase having two or more distinct meanings, not from the grammar or structure of the sentence.<ref name="Damer2008"/>
Fallacy of four terms
Equivocation in a syllogism (a chain of reasoning) produces a fallacy of four terms (Template:Lang). Below is an example:
- Since only man [human] is rational.
- And no woman is a man [male].
- Therefore, no woman is rational.<ref name="Damer2008" />
The first instance of "man" implies the entire human species, while the second implies just those who are male.
Motte-and-bailey fallacy
Equivocation can also be used to conflate two positions which share similarities, one modest and easy to defend and one much more controversial. The arguer advances the controversial position, but when challenged, they insist that they are only advancing the more modest position.
See also
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- Antanaclasis: A related purposeful rhetorical device
- Circumlocution: Phrasing to explain something without saying it
- Equivocality: Organizational information theory
- Etymological fallacy: A kind of linguistic misconception
- Evasion (ethics): Tell the truth while deceiving
- False equivalence: Fallacy based on flawed reasoning
- If-by-whiskey: An example
- Map-territory relation: Concept that words used to describe an underlying reality are arbitrary abstractions not to be confused with the reality itself
- Mental reservation: A doctrine in moral theology
- No true Scotsman: Changing a definition to exclude a counter-example
- Persuasive definition: Skewed definition of term
- Plausible deniability: A blame-shifting technique
- Polysemy: The property of word or phrase having certain type of multiple meanings
- Principle of explosion: One of the fundamental laws in logic
- Syntactic ambiguity, Amphiboly, Amphibology: Ambiguity of a sentence by its grammatical structure
- When a white horse is not a horse: An example