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undistributed middle

Logic. a middle term of a syllogism that does not refer to its entire class in the major premise or minor premise, with the result that the syllogism is not valid.
Origin of undistributed middle
First recorded in 1820-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for undistributed middle
Historical Examples
  • You have committed the fallacy of the undistributed middle term, if you care to know the proper name for it.

    Mr. Isaacs F. Marion Crawford
  • Moreover, not till a man's work is translated can we uncover all the unconscious cases of "undistributed middle."

    Plotinos: Complete Works, v. 4 Plotinos (Plotinus)

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