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Equivocation


Equivocation ("to call by the same name") is an informal logical fallacy. It is the misleading use of a term with more than one meaning or sense (by glossing over which meaning is intended at a particular time). It generally occurs with polysemic words (words with multiple meanings).

Albeit in common parlance it is used in a variety of contexts, when discussed as a fallacy, equivocation only occurs when the arguer makes a word or phrase employed in two (or more) different senses in an argument appear to have the same meaning throughout.

It is therefore distinct from (semantic) ambiguity, which means that the context doesn't make the meaning of the word or phrase clear, and amphiboly (or syntactical ambiguity), which refers to ambiguous sentence structure due to punctuation or syntax.

A common case of equivocation is the fallacious use in a syllogism (a logical chain of reasoning) of a term several times, but giving the term a different meaning each time.

In the above example distinct meanings of the word "light" are implied in contexts of the first and second statements.

Here the equivocation is the metaphorical use of "jackass" to imply a stupid or obnoxious person instead of a male donkey.


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