Contradiction
Related: contra - opposition - paradox
Definition
Broadly speaking, a contradiction is when two or more statements, ideas, or actions are seen as incompatible. One must, it seems, reject at least one of the ideas outright.
In logic, contradiction is defined much more specifically, usually as the simultaneous assertion of a statement and its negation ("denial" can be used instead of "negation"). (See law of non-contradiction.) This, of course, assumes that "negation" has a non-problematic definition.
In colloquial speech and in dialectical methodology, the word "contradiction" has a completely different meaning than in formal logic. --http://en.wikipedia.org/wiki/Contradiction [Jul 2005]
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