precautionary

Concise Oxford English Dictionary © 2008 Oxford University Press:
precaution/prɪˈkɔːʃn/

▶noun

• 1 a measure taken in advance to prevent something undesirable happening.

• 2 (precautions) informal contraception.

– derivatives
precautionary adjective.

– origin C16: from Fr. précaution, from late L. praecautio(n-), from L. praecavere, from prae ‘before’ + cavere ‘take heed, beware of’.