Aristotelian logic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Aristotle's deductive method of logic, especially the theory of the syllogism.
• noun The formal logic based on Aristotle's and dealing with the relations between propositions in terms of their form instead of their content.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the syllogistic logic of Aristotle as developed by Boethius in the Middle Ages