SAT GRE invalidate Definition To make legally or factually invalid or void. Example "New evidence could invalidate the court's earlier decision." Sign in to save SAT PDF — $25 GRE PDF — $25 ← invalid invaluable → Study tips featuring "invalidate" How Context Clues Save You on the SAT Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal