nullify Meaning, Definition & Usage

  1. verb declare invalid
    invalidate; annul; void; quash; avoid.
    • The contract was annulled
    • void a plea
  2. verb show to be invalid
    invalidate.
  3. verb make ineffective by counterbalancing the effect of
    negate; neutralise; neutralize.
    • Her optimism neutralizes his gloom
    • This action will negate the effect of my efforts

WordNet

Nul"li*fy transitive verb
Etymology
L. nullificare; nullus none + -ficare (in comp.) to make. See Null, a., and -fy.
Wordforms
imperfect & past participle Nullified ; present participle & verbal noun Nullifying
Definitions
  1. To make void; to render invalid; to deprive of legal force or efficacy.
    Such correspondence would at once nullify the conditions of the probationary system. I. Taylor.
    Syn. -- To abrogate; revoke; annul; repeal; invalidate; cancel. See Abolish.

Webster 1913