Meaning of precaution

(noun) a precautionary measure warding off impending danger or damage or injury etc.; "he put an ice pack on the injury as a precaution"; "an insurance policy is a good safeguard"; "we let our guard down"

the trait of practicing caution in advance

judiciousness in avoiding harm or danger; "he exercised caution in opening the door"; "he handled the vase with care"