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.
to watch over or guard as a sentinel.
- sen·ti·nel·like, adjective
- sen·ti·nel·ship, noun
- un·sen·ti·neled, adjective
- un·sen·ti·nelled, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use sentinel in a sentence
The police feel that they’re getting an always available sentinel standing guard in front of the homes of repeat victims of crime.How Amazon Ring uses domestic violence to market doorbell cameras | Eileen Guo | September 20, 2021 | MIT Technology Review
These sentinels stay in contact with systems equipped to issue streams of calibrated instructions to the parts of the body that can act to maintain stability.
This clinical strategy relies both on infected individuals coming to sentinel hospitals and medical authorities who are influential and persistent enough to raise the alarm.The Next Pandemic Is Already Happening – Targeted Disease Surveillance Can Help Prevent It | LGBTQ-Editor | June 7, 2021 | No Straight News
That’s the Kinyarwandan name for the eight volcanoes — two active, six dormant — that stand sentinel over the tripartite border of Uganda, Rwanda and Congo.In East Africa, mountain gorillas and a new paradigm for wildlife travel | Henry Wismayer | April 23, 2021 | Washington Post
It matters where tohorā feed and how their populations recover from whaling because the species is recognised as a sentinel for climate change throughout the Southern Hemisphere.The secret to helping this resilient whale species lies in its genes | By Emma Carroll/The Conversation | November 2, 2020 | Popular-Science
The program, Satellite sentinel Project, is designed to document and deter atrocities against civilians.
Clooney heads the Satellite sentinel Project, which monitors human rights abuses.After the Wedding: George Clooney and Amal Alamuddin in Venice | Barbie Latza Nadeau | September 28, 2014 | THE DAILY BEAST
They were reading the Lodi News-sentinel and the Indianapolis Star and the Milwaukee Journal.
“The more I thought about it, the more sense it made,” she told the Sun-sentinel in 1998.
A web promotion for X-Men: Days of Future Past indicated that the character had been killed by a sentinel in 2011.
The Café tender was asleep in his chair; the porter had gone off; the sentinel alone kept awake on his post.Glances at Europe | Horace Greeley
The sentinel was singing a sequedilla above; and its notes came to them with the wailing blast.The Pastor's Fire-side Vol. 3 of 4 | Jane Porter
The sentinel stood leaning against a tree, his head on his breast, apparently sound asleep.The Courier of the Ozarks | Byron A. Dunn
A few miles in advance of the island stands the beautiful Falcon Rock, like a sentinel upon the look-out.A Woman's Journey Round the World | Ida Pfeiffer
At length he approached a sentinel, who called “halt” three times without response, and then shot the lieutenant dead.The Philippine Islands | John Foreman
British Dictionary definitions for sentinel
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012