To reactivate something is to make it active again. When you reactivate a computer, you make it work again.
The computer was reactivated after it had been frozen by the virus.
The company reactivated the old website after it had been abandoned for years.
verb
activate (an old file) anew
1
This is the reactive part of the algorithm.
2
The reactive type of angioendotheliomatosis is uncommon.
3
In Scientology there is the reactive mind and the analytical mind.
4
Some dogs are not that reactive towards people.
5
Halogens are reactive enough to for diatomic molecules.
6
The method of the formation of the power is the reactive power.
7
In the reactive application, TBBPA is bound chemically to the polymers.
8
The oxidizer is the other reactive one of the chemical reaction.
9
The reactive centrifugal force applies to the car door.
10
The thymus and the precursors of antigen reactive cells are needed.