Definitions

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

  • adjective Involving, of the nature of, or being a contradiction: synonym: opposite.
  • adjective Given to contradicting.
  • noun Either of two propositions related in such a way that it is impossible for both to be true or both to be false.

from The Century Dictionary.

  • Denying that something stated or approved is completely true; diametrically opposed.
  • Inconsistent; logically antagonistic; incapable of being true together (though both may be false).
  • Synonyms Contrary, Inconsistent, etc. See contrary.
  • noun pl. contradictories (-riz). A proposition of a pair inconsistent with each other, or each of which precisely denies or falsifies the other.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Affirming the contrary; implying a denial of what has been asserted; also, mutually contradicting; inconsistent.
  • adjective Opposing or opposed; repugnant.
  • noun A proposition or thing which denies or opposes another; contrariety.
  • noun (Logic) propositions with the same terms, but opposed to each other both in quality and quantity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective That contradicts something, such as an argument.
  • adjective That is itself a contradiction.
  • adjective That is diametrically opposed to something.
  • adjective Mutually exclusive.
  • adjective Tending to contradict or oppose, contrarious
  • noun logic Any of a pair of propositions, that cannot both be true or both be false.

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

  • adjective in disagreement
  • adjective that confounds or contradicts or confuses
  • adjective unable to be both true at the same time
  • adjective of words or propositions so related that both cannot be true and both cannot be false
  • noun two propositions are contradictories if both cannot be true (or both cannot be false) at the same time

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