Medical Definition of reactivate
: to activate again : cause to be again active or more active: asa: to cause (as a repressed complex) to reappear in consciousness or behavior persecution feelings reactivated by new social failuresb: to cause (a quiescent disease) to become active again in an individual a herpes infection reactivated by physical and emotional stressesc: to restore complement to (an inactivated serum) by addition of fresh normal serum
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