This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To make active again.

v. To restore the ability to function or the effectiveness of.

v. To activate again.

To render active again: used specifically of the process of restoring the activity of an immune serum after the destruction of its complement. See reactivation.

v. activate (an old file) anew

"Even so, simply setting your computer's clock back a few months will "reactivate" the expired beta should you ever need to extract data (for instance if you ignore the fact stated above about the data being Finder accessible even if DT is no long on your Mac)."

reactivated    reactivates    reactivating   

activate   

activate