invalidate Meaning, Definition & Usage

  1. verb declare invalid
    annul; void; nullify; quash; avoid.
    • The contract was annulled
    • void a plea
  2. verb make invalid for use
    cancel.
    • cancel cheques or tickets
  3. verb show to be invalid
    nullify.
  4. verb take away the legal force of or render ineffective
    void; vitiate.
    • invalidate a contract

WordNet

In*val"i*date transitive verb
Etymology
From Invalid null.
Wordforms
imperfect & past participle Invalidated ; present participle & verbal noun Invalidating
Definitions
  1. To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument.

Webster 1913