pre‧cau‧tion‧a‧ry /prɪˈkɔːʃ
ən
əri $ -ˈkɒːʃ
əneri/ 
 adjective done in order to prevent something dangerous or unpleasant from happening: 
 More troops were sent to the area as a precautionary measure.
 More troops were sent to the area as a precautionary measure.  [TahlilGaran] Dictionary of Contemporary English ▲