- a person or thing that watches or stands as if watching.
- a soldier stationed as a guard to challenge all comers and prevent a surprise attack: to stand sentinel.
- Digital Technology. tag1(def 9a).
- to watch over or guard as a sentinel.
Origin of sentinel
SynonymsSee more synonyms for sentinel on Thesaurus.com
Examples from the Web for sentinel
A web promotion for X-Men: Days of Future Past indicated that the character had been killed by a Sentinel in 2011.X-Men’s Post-Credits Apocalypse Scene Explained
May 26, 2014
That might have been what happened to the Sentinel that landed in Iran.
They may be taking some action in the future, given the weaknesses that appear to have been exposed in the Sentinel.
When Johnston talks about the failure of the Sentinel in Iran, he sounds frustrated.
A sentinel is present 24 hours a day, seven days a week, 365 days a year, including holidays.Washington Institution Defies Hurricane
August 26, 2011
Like a sentinel on that solitary plain it overwhelms me with a sense of mystery.Ballads of a Bohemian
Robert W. Service
After that, we were allowed to come on deck singly, only, and then under a sentinel's charge.Ned Myers
James Fenimore Cooper
Neither of the lads so much as glanced at the sentinel as they strolled past him.The Cruise of the Dry Dock
T. S. Stribling
He did not care, now, if he were halted by a British picket or sentinel.
This would be difficult, for the reason that there was a sentinel on the deck.
- a person, such as a sentry, assigned to keep guard
- computing a character used to indicate the beginning or end of a particular block of information
- to guard as a sentinel
- to post as a sentinel
- to provide with a sentinel
Word Origin and History for sentinel
1570s, from Middle French sentinelle (16c.), from Italian sentinella "a sentinel." OED says "No convincing etymology of the It. word has been proposed," but perhaps (via a notion of "perceive, watch"), from sentire "to hear," from Latin sentire "feel, perceive by the senses" (see sense (n.)).