noun (n)

• the process of paying close and continuous attention

  proses membayar perhatian dekat dan berterusan

  Example:
  Vigilance is especially susceptible to fatigue.
  

  Synonym:
  alertness, wakefulness, watchfulness
  

  source: wordnet30
• vigilant attentiveness

  waspada attentiveness

  Synonym:
  watchfulness, weather eye
  

  source: wordnet30
• The quality or state of being vigilant; forbearance of sleep; wakefulness.

  kualiti atau keadaan menjadi waspada; kesabaran untuk tidur; wakefulness.

  source: webster1913