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.
Also called tag.Computers. a symbol, mark, or other labeling device indicating the beginning or end of a unit of information.
verb (used with object)
4.
to watch over or guard as a sentinel.
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Sentinelsis always a great word to know.
So is slumgullion. Does it mean:
So is quincunx. Does it mean:
So is flibbertigibbet. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a stew of meat, vegetables, potatoes, etc.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Origin: 1570–80; < Middle French sentinelle < Italian sentinella, derivative of Old Italian sentina vigilance (Latin sent(īre) to observe) + -īna-ine2)