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English definition of “precaution”

precaution

noun [C]     /prɪˈkɔːʃən/
something that you do to prevent bad things happening in the future : Driving alone at night can be dangerous , so always take precautions. They called the doctor as a precaution. [+ of + doing sth] He took the precaution of locking the door .Protection and protectorsEnvironmental issues
precautionary adjective a precautionary measure/step something that you do in order to prevent something bad from happening Defending and protectingBacking, supporting and defendingPreserving and saving
(Definition of precaution noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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