It's when there is something you're trying to stop (prevent) from happening, so you take a preventive measure (do something) to stop the thing you think might happen.
Quarentine
Profalactic
removed stagnate water
Washing it is a good preventive measure.
Exercise.
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Yes, arrest is used as a preventive measure. Criminals, thieves and robbers are usually arrested so that they do not cause problems to the public.
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there is no cure for malaria, however, it can be treated with doses of quinine, also to be used as a preventive measure.
The separation of the Purchasing Department and Accounting Department personnel would be a preventative control measure.
Consider it a preventive measure.
By not drinking as much. EVERY hang-over cure and preventive measure are either myths or lies.