vig·il /ˈvɪʤəl/
  警戒,監視,守夜
  Vig·il n.
  1. Abstinence from sleep, whether at a time when sleep is customary or not; the act of keeping awake, or the state of being awake; sleeplessness; wakefulness; watch.  “Worn out by the labors and vigils of many months.”
     Nothing wears out a fine face like the vigils of the card table and those cutting passions which attend them.   --Addison.
  2. Hence, devotional watching; waking for prayer, or other religious exercises.
     So they in heaven their odes and vigils tuned.   --Milton.
  Be sober and keep vigil,
  The Judge is at the gate.   --Neale (Rhythm of St. Bernard).
  3. Eccl. (a) Originally, the watch kept on the night before a feast.  (b) Later, the day and the night preceding a feast.
  He that shall live this day, and see old age,
  Will yearly on the vigil feast his neighbors,
  And say, “To-morrow is St. Crispian.”   --Shak.
  (c) A religious service performed in the evening preceding a feast.
  Vigils of flowers or Watchings of flowers Bot., a peculiar faculty belonging to the flowers of certain plants of opening and closing their petals at certain hours of the day. [R.]
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  vigil
       n 1: a period of sleeplessness
       2: a devotional watch (especially on the eve of a religious
          festival) [syn: watch]
       3: a purposeful surveillance to guard or observe [syn: watch]