Definition of undistributed middle in English:

undistributed middle

Syllabification: un·dis·trib·ut·ed mid·dle


  • 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.
    More 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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