— Equivocation fallacy —

Fallacy definition (short name: equivocation)


From Wikipedia1:

Equivocation is classified as both a formal and informal 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).

Canonical example

From Wikipedia1:

A feather is light.
What is light cannot be dark.
Therefore, a feather cannot be dark.

1 Wikipedia notice for Equivocation

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