law of the excluded middle
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law of the excluded middle[¦lȯ əvthē ik‚sklüd·əd ′mid·əl]
A principle of logic whereby a proposition is either true or false but cannot be both true and false. Also known as principle of dichotomy.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.