*Some of these glossary definitions have been adapted and reproduced by permission of The American Heritage Dictionary of the English Language, Fourth Edition. Copyright © 2002 by Houghton Mifflin Company. Many computer and Web-related definitions have been contributed by Jason Snart, College of DuPage.

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quality An inherent or distinguishing characteristic; property; essential character or nature.

questionable cause A causal fallacy that occurs when someone presents a causal relationship for which no real evidence exists.