Definition for SEN'TI-NEL

SEN'TI-NEL, n. [Fr. sentinelle; It. and Port. sentinella; Sp. centinela; from L. sentio, to perceive.]

In military affairs, a soldier set to watch or guard an army, camp or other place from surprise, to observe the approach of danger and give notice of it. In popular use, the word is contracted into Sentry.

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