1. The act of nullifying or the state of being nullified: a referee's nullification of a goal for being scored in violation of a rule.
a. The action by a state not to enforce a federal law as improperly encroaching on the scope of state power.
b. A theory justifying such action.
3. See jury nullification.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.