Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: , past participle of praevenire 'to come before'

prevent

verb
     
pre‧vent S2 W1 [transitive]
to stop something from happening, or stop someone from doing something:
The rules are intended to prevent accidents.
prevent somebody/something (from) doing something
His back injury may prevent him from playing in tomorrow's game.
We were prevented from entering the site.
Wrap small ornaments in paper to prevent them being damaged.
preventable adjective:
preventable diseases
Every one of these deaths is preventable.

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