Definition of undistributed middle in English:

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undistributed middle

noun

Logic
A fallacy arising from the failure of the middle term of a syllogism to refer to all the members of a class in at least one premise.
Example sentences
  • In syllogistic logic, failing to distribute the middle term over at least one of the other terms is the fallacy of undistributed middle.
  • That's the fallacy of the undistributed middle, or some such.
  • Or perhaps it was the fallacy called undistributed middle in syllogistic logic.
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