Definition of sentinel
(Entry 1 of 2)
: sentry
sentinel
verb
sentineled or sentinelled; sentineling or sentinelling
Definition of sentinel (Entry 2 of 2)
1
: to watch over as a sentinel
2
: to furnish with a sentinel
3
: to post as sentinel
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Merriam-Webster unabridged
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Time Traveler for sentinel
The first known use of sentinel was in 1579
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