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Definition of precaution noun from the Oxford Advanced American Dictionary

precaution

noun
/prɪˈkɔʃn/ precaution pronunciation American
[usually plural]
 
1 precaution (against something) something that is done in advance in order to prevent problems or to avoid dangersafety precautionsprecautions against fireYou must take all reasonable precautions to protect yourself and your family.I'll keep the letter as a precaution.2 precautions [plural] a way of referring to contraceptionThey didn't take any precautions and she got pregnant. precautionary
/prɪˈkɔʃəˌnɛri/ precautionary pronunciation American
adjectiveHe was kept in the hospital overnight as a precautionary measure.