Invalidate Definition
 ĭn-vălĭ-dāt 
  invalidated, invalidates, invalidating
  
    verb
  
 
    invalidated, invalidates, invalidating
  
To make invalid; deprive of legal force.
 Webster's New World 
Synonyms: 
  Origin of Invalidate
-  
From in- + Latin valere (“to be strong”); literally, “to make not strong”.
From Wiktionary
 
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