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excluded middle

British  

noun

  1. logic the principle that every proposition is either true or false, so that there is no third truth-value and no statements lack truth-value

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Law of the excluded middle a logical law that states that for any statement, either that statement or its negation is true.

From Textbooks • Jun. 15, 2022

If you accept that all statements must be either true or false and you also accept the law of noncontradiction, then you must accept the law of the excluded middle.

From Textbooks • Jun. 15, 2022

How does the law of noncontradiction logically imply the law of the excluded middle?

From Textbooks • Jun. 15, 2022

Define the laws of noncontradiction and the excluded middle.

From Textbooks • Jun. 15, 2022

For, on the supposition, a thing would be something else, whereas all that the law of excluded middle demands is that it should either be itself or not.

From Deductive Logic by Stock, St. George William Joseph