from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To make null; invalidate.
- transitive v. To counteract the force or effectiveness of.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. to make legally invalid.
- v. to prevent from happening
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To make void; to render invalid; to deprive of legal force or efficacy.
from The Century Dictionary and Cyclopedia
- To annul; make void; render invalid; deprive of force or efficacy.
- Synonyms Annul, Annihilate, etc. See neutralize.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. show to be invalid
- v. declare invalid
- v. make ineffective by counterbalancing the effect of
Latin nūllificāre, to despise : nūllus, none; see ne in Indo-European roots + -ficāre, -fy.(American Heritage® Dictionary of the English Language, Fourth Edition)
null + -ify. (Wiktionary)