English UsageComparison guide
Preventive vs. Preventative
Treat the two forms as accepted variants rather than assigning different meanings to them.
Both “preventive” and “preventative” are accepted adjectives meaning intended to stop something before it happens. “Preventative” is recorded as another form of “preventive.”
Key details
Confusion Familyaccepted variant forms
Rule Familyspelling variation
Termspreventive, preventative
Variant ScopeMajor dictionaries record both forms with the same core meaning; this is not a reliable meaning distinction.
Further guidance
Core difference
Treat the two forms as accepted variants rather than assigning different meanings to them.
Fast Test
Follow the spelling preferred by your publication, organization, or established usage, and stay consistent.
Usage Boundary
Do not claim that “preventative” is automatically incorrect or that it carries a separate standard meaning.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Preventive — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Direct dictionary evidence that “preventive” means intended to stop something before it happens and records “preventative” as an alternative form.
- Preventative — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Direct dictionary evidence that “preventative” is another word for “preventive.”