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Definition of precautionary adjective from the Oxford Advanced Learner's Dictionary

precautionary

adjective
 
/prɪˈkɔːʃənəri/
 
/prɪˈkɔːʃəneri/
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  1. done in order to prevent problems or to avoid danger
    • He was kept in the hospital overnight as a precautionary measure.
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adverb
 
 
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