Etymology
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precaution (n.)

"previous caution, prudent foresight (to prevent mischief or secure good results); a measure taken beforehand, an act of foresight," c. 1600, from French précaution (16c.) and directly from Late Latin praecautionem (nominative praecautio) "a safeguarding," noun of action from past-participle stem of Latin praecavere "to guard against beforehand," from prae "before" (see pre-) + cavere "to be one's own guard" (see caution (n.)). In mid-20c. a euphemism for "contraception." The verb meaning "to warn (someone) in advance" is from c. 1700.

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Definitions of precaution

precaution (n.)
a precautionary measure warding off impending danger or damage or injury etc.;
he put an ice pack on the injury as a precaution
Synonyms: safeguard / guard
precaution (n.)
the trait of practicing caution in advance;
precaution (n.)
judiciousness in avoiding harm or danger;
Synonyms: caution / care / forethought
From wordnet.princeton.edu