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)