Longman Dictionary of Contemporary English homepage

prevention

 noun
     
pre‧ven‧tion [uncountable]
when something bad is stopped from happening
prevention of
Educating new drivers is important for the prevention of accidents.
crime/accident/fire etc prevention
Effective crime prevention must be our main goal.
a fire prevention officer
You know what they say, prevention is better than cure (=it is better to stop something bad from happening than to remove the problem once it has happened).
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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