Definition of precaution noun from the Oxford Advanced American Dictionary

precaution

noun
/prɪˈkɔʃn/
 
[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/
 
adjectiveHe was kept in the hospital overnight as a precautionary measure.
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