1
Stage 1 of 4
sentire
Latin · ancient
"to feel, perceive"
speculatively linked to the verb of feeling or perceiving
2
Stage 2 of 4
sentinella
Italian · medieval
"a guard, watchman"
a noun for a watchful guard, of disputed deeper formation
3
Stage 3 of 4
sentinelle
French · 1500s
"a sentry"
borrowed from Italian for a military lookout
4
Stage 4 of 4
sentinel
English · 1570s
"a soldier or guard stationed to watch"
adopted for a soldier stationed to keep watch
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