Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
the branch of logic that examines patterns of reasoning to determine which ones necessarily result in valid, or formally correct, conclusions
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The study of the properties of propositions and deductive reasoning by abstraction and analysis of the form rather than the content of propositions under consideration.