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English definition of “sentinel”

sentinel

noun [C]     /ˈsen.tɪ.nəl/ US  /-t̬ɪ-/
literary a person employed to guard something: A policeman stood sentinel at the entrance. → Synonym sentryProtection and protectorsEnvironmental issues mainly US Sentinel is also used in the names of some newspapers: the Fort Lauderdale Sun-SentinelNewspapers and magazines
(Definition of sentinel noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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