Noun and する verb
ぼうし
警察がこの町の犯罪の拡大を防止してくれています。
The police have prevented crime from spreading in this town.
今日は学校で、地球温だん化防止について話し合いをしました。
Today we discussed the prevention of global warming at school.
日本の通貨は、世界一優れた偽造防止技術が使われていることで知られていますが、ビエトはそれを打ち負かそうとしています。
Japanese currency is known for incorporating the world’s most advanced counterfeit prevention technology, but Viet is planning to defeat it.
To prevent and stop someone from doing something is prevention. It's good to have prevention instead of letting something bad happen.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.