Definition of precaution noun from the Oxford Advanced American Dictionary

     

    precaution

     noun
    noun
    NAmE//prɪˈkɔʃn//
     
    [usually plural]
     
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  1. 1precaution (against something) something that is done in advance in order to prevent problems or to avoid danger safety precautions precautions against fire You must take all reasonable precautions to protect yourself and your family. I'll keep the letter as a precaution.
  2. 2precautions [plural] a way of referring to contraception They didn't take any precautions and she got pregnant.
precautionary
 
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NAmE//prɪˈkɔʃəˌnɛri//
 
adjective He was kept in the hospital overnight as a precautionary measure.
See the Oxford Advanced Learner's Dictionary entry: precaution