precautionary Definition

precaution
noun

1. A measure taken to ensure a satisfactory outcome, or to avoid a risk or danger.

Thesaurus: safeguard, security, preparation, insurance, protection, safety measure, buffer.
2. Caution exercised beforehand.

Thesaurus: caution, provision, care, foresight, forethought, prudence, anticipation, circumspection.

Derivative: precautionary
adj

(of a measure) taken to avoid a risk or danger
Thesaurus: preventive, protective, self-protective, provisional, preparatory, anticipatory, preliminary, judicious, foresighted, cautious, safe, prudent, prophylactic, provident, foresightful; Antonym: reckless.

Etymology: 17c: from Latin praecautio, from cavere to beware.