Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A guard, especially a soldier posted at a given spot to prevent the passage of unauthorized persons.
  • n. The duty of a sentry; watch.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A guard, particularly on duty at the entrance to a military base.
  • n. Sentry duty; time spent being a sentry.

from the GNU version of the Collaborative International Dictionary of English

  • n. A soldier placed on guard; a sentinel.
  • n. Guard; watch, as by a sentinel.

from The Century Dictionary and Cyclopedia

  • n. A place of watch; a watch-tower.
  • n. Watch; guard: same as sentinel, 1.
  • n. One stationed as a guard: same as sentinel, 2.
  • Acting as a sentry; watching.
  • n. Same as centry, center.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a person employed to keep watch for some anticipated event

Etymologies

Perhaps alteration of obsolete sentrinel, variant of sentinel.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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