Vigilance is devoted attentiveness or watchfulness. Security guards and test proctors alike need to practice vigilance.

Vigilance comes from the Latin word for "wakefulness," vigilantia, and in a medical setting vigilance is still sometimes used to mean "insomnia." A prison guard might be required to maintain vigilance the whole time she's working, always being alert and watchful.

Definitions of vigilance
  1. noun
    the process of paying close and continuous attention
    vigilance is especially susceptible to fatigue”
    synonyms: alertness, wakefulness, watchfulness
    see moresee less
    zealous vigilance
    type of:
    the faculty or power of mental concentration
  2. noun
    vigilant attentiveness
    synonyms: watchfulness, weather eye
    see moresee less
    type of:
    the trait of being observant and paying attention
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week