Webster's English Dictionary

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precaution

pre.cau.tion \pri-'ko.-sh*n\ \-sh*-.ner-e-\ n [F pre`caution, fr. LL 
   praecaution-, praecautio, fr. L pr]aecautus, pp. of praecave-re to guard 
   against, fr. prae- + cave-re to be on one's guard - more at HEAR 1: care 
   taken in advance : FORESIGHT  2: a measure taken beforehand to prevent harm 
   or secure good : SAFEGUA RD - pre.cau.tio.nary aj