from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To annul or cancel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To annul, do away with; to cancel.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To annul completely; to render void or of no effect.
from The Century Dictionary and Cyclopedia
- To make void; annul; deprive of force or authority; cancel.
- To deprive (of).
From dis- + annul. (Wiktionary)