INVALIDATE

Definition:

1. [verb] declare invalid; "The contract was annulled"; "void a plea"
   Synonyms: annul, quash, void, avoid, nullify
   
   
2. [verb] of cheques or tickets
   Synonyms: cancel
   
   
3. [verb] show to be invalid
   Synonyms: nullify
   
   
4. [verb] take away the legal force of or render ineffective; "invalidateas a contract"
   Synonyms: void, vitiate
   
   

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Related Words:

• break
• stet