Part of speech: noun

Alertness; watchfulness.

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Usage examples "vigilance":

  1. They watched in the ante- chamber: and it was their vigilance which saved her life. - "The Peasant and the Prince", Harriet Martineau.
  2. Dusty Star, for all his vigilance, did not fully understand. - "Dusty Star", Olaf Baker.
  3. It requires in the doctor a degree of skill, of practical experience, vigilance, decision, and sureness of hand which no man can be expected to possess at the first outbreak of the epizootia. - "On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment", Honoré Bourguignon.