invalidate
1. [ verb ] (law) declare invalid
Synonyms: quash void avoid nullify annul
Examples:

"The contract was annulled" "avoid a plea"

Related terms: validate cancel break stet nullifier invalidator nothingness annulment
2. [ verb ] show to be invalid
Synonyms: nullify
Related terms: validate negate
3. [ verb ] of cheques or tickets
Synonyms: cancel
Related terms: score
4. [ verb ] (law) take away the legal force of or render ineffective;
Synonyms: vitiate void
Examples:

"invalidateas a contract"

Related terms: validate change vitiation
Similar spelling:   invalidated
  invalid
  invalidator
  invalidation
  invalidating
  invalidness
  inapplicable
  invaluable
  invalidity
  invalidism
  inflict
  in_flight