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sentinel (n.)

1570s, from 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.)).

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Definitions of sentinel from WordNet

sentinel (n.)
a person employed to keep watch for some anticipated event;
Synonyms: lookout / lookout man / sentry / watch / spotter / scout / picket
From wordnet.princeton.edu