from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To oppose, contradict, or call into question.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To contradict or controvert; to oppose; to challenge or question the truth or validity of a given statement.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To fight against; to attack; to be in conflict with; to oppose; to resist.

from The Century Dictionary and Cyclopedia

  • To fight against; oppose; resist.
  • To attack; oppose, as by argument; make an assault upon.

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

  • v. challenge the accuracy, probity, or propriety of


Middle English oppugnen, from Latin oppugnāre, to attack : ob-, against; see ob- + pugnāre, to fight with the fist; see peuk- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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