vt, -vat*ed  -vat*ing  :  to activate again  :  cause to be again active or more active: as  a  :  to cause (as a repressed complex) to reappear in consciousness or behavior <persecution feelings reactivated by new social failures>   b  :  to cause (a quiescent disease) to become active again in an individual <a herpes infection reactivated by physical and emotional stresses>   c  :  to restore complement to (an inactivated serum) by addition of fresh normal serum .
 
 
 
Similar sounding terms:  re·ac·tiv·i·ty 
 
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