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precaution (n.)

c. 1600, from French précaution (16c.) and directly from Late Latin praecautionem (nominative praecautio) "a safeguarding," 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.)). The verb meaning "to warn (someone) in advance" is from c. 1700.

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Definitions of precaution from WordNet

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