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Latin excubatio, from excubare to lie out on guard; ex out on guard; ex out + cubare to lie down.


excubation ‎(uncountable)

  1. (obsolete) A keeping watch; a vigil.
    • 1814, John Colin Dunlop, The History of Fiction:
      Yseult, who was not in the secret, demanded the reason of this perpetual excubation, and was, for the first time, informed that Tristan had sent for the queen of Cornwall.
    • (Can we date this quote?), Philonauta, Naval Progression, or the Midshipman of the Old School
      Infinitely more so than the lucubrations
      Is the necessity there is for excubations.
      Hard's the duty in three watches—worse watch and watch—
      Expos'd to the elements without a thatch []