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sentinel

[sen-tn-l] /ˈsɛn tn l/
noun
1.
a person or thing that watches or stands as if watching.
2.
a soldier stationed as a guard to challenge all comers and prevent a surprise attack:
to stand sentinel.
3.
Digital Technology, tag1 (def 9a).
verb (used with object), sentineled, sentineling or (especially British) sentinelled, sentinelling.
4.
to watch over or guard as a sentinel.
Origin
1570-1580
1570-80; < Middle French sentinelle < Italian sentinella, derivative of Old Italian sentina vigilance (Latin sent(īre) to observe) + -īna -ine2)
Related forms
sentinellike, adjective
sentinelship, noun
unsentineled, adjective
unsentinelled, adjective
Synonyms
1, 2. sentry, guard, watch, lookout.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sentinelship

sentinel

/ˈsɛntɪnəl/
noun
1.
a person, such as a sentry, assigned to keep guard
2.
(computing) a character used to indicate the beginning or end of a particular block of information
verb (transitive) -nels, -nelling, -nelled
3.
to guard as a sentinel
4.
to post as a sentinel
5.
to provide with a sentinel
Word Origin
C16: from Old French sentinelle, from Old Italian sentinella, from sentina watchfulness, from sentire to notice, from Latin
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
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Word Origin and History for sentinelship
sentinel
1579, from M.Fr. sentinelle, from It. sentinella, perhaps (via a notion of "perceive, watch"), from sentire "to hear, perceive," from L. senire "feel" (see sense).
Online Etymology Dictionary, © 2010 Douglas Harper
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