Etymology From French précaution, Latin praecautio, from praecavere, praecautum (“to guard against beforehand”); prae (“before”) + cavere (“be on one's guard”). See pre-, and caution.
1
Previous caution or care; caution previously employed to prevent misfortune or to secure good.
his life was saved by precaution
July 2, 1826, John Henry Newman, The Philosophical Temper, First Enjoined by the Gospel The ancient philosophers treasured up their supposed discoveries with miserable precaution.
2
A measure taken beforehand to ward off evil or secure good or success; a precautionary act.
to take precautions against risks of accident
Despite all these precautions, however, severe storms sometimes caused drifts which brought traffic completely to a standstill.1955 December, H. A. Vallance, “The Highland Centenary—2”, in Railway Magazine, page 859:
Etymology From French précaution, Latin praecautio, from praecavere, praecautum (“to guard against beforehand”); prae (“before”) + cavere (“be on one's guard”). See pre-, and caution.