Preventive means done in advance to stop a problem arising. Preventive medicine, preventive maintenance, preventive measures.
Preventive maintenance replaces a part before it fails, on the finding that a planned stop costs far less than an unplanned one. Preventive medicine works the same way with disease. Note preventative, which means the same and has an extra syllable; both are correct and the shorter one is preferred in technical writing.
1adjectivepreventiveDone in advance to stop a problem arising.
“Regular check-ups at the dentist are a form of preventive care.”
preventive is a quality of forestalling.
New Latin praeventivus comes from praevenire, to come before — prae plus venire. Prevent, advent and convene come from the same coming.
New Latin
praeventīvus
English, today
preventive
Borrowed from New Latin praeventīvus. Equivalent to prevent + ive.
Etymology from Wiktionary, CC BY-SA