1) Activate 2) Activate anew 3) Start up again 4) To activate again 1) Demothball 
To make active again or make something work again. In medicine, an infection or a disease is described as reactivated when it comes back after a period with no signs of disease.
1. To render active again. ... 2. In particular, of an inactivated immune serum to which normal serum (complement) is added. ... (05 Mar 2000) ... 
Type: Term Pronunciation: rē-ak′ti-vāt Definitions: 1. To render active again. 2. In particular, of an inactivated immune serum to which normal serum (complement) is added.
[v] - activate anew