Prevention
Prevent
noun, する verb, の adjective
To prevent beforehand is still prevention.
よぼう
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.
危機かん理がもっとしっかりしていたら、この事故は事前に予防することができたはずだ。
If we had better risk management, we would have been able to prevent this accident.
その国に行くなら、事前に必ずマラリア予防の薬を飲んでください。
If you go to that country, please make sure to take medicine to prevent malaria beforehand.
日本人も十年ごとに破傷風の予防接種を受けるのですか？
Do Japanese people get a tetanus vaccination every ten years, too?