Usually means: Formal system of deductive reasoning.
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We found 8 dictionaries that define the word classical logic:

General (3 matching dictionaries)
  1. classical logic: Wiktionary
  2. classical logic: Dictionary.com
  3. Classical logic: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. classical logic: Free On-line Dictionary of Computing
  2. classical logic: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (2 matching dictionaries)
  1. classical logic: PlanetMath Encyclopedia
  2. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Definitions from Wiktionary (classical logic)

noun:  (logic) A kind of logic based on the principles that each proposition has a truth value of either "true" or "false", but not both, and that if a proposition were to be both true and false or neither true nor false then a result would be that all propositions would be both true and false.

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