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Italian word insegnare comes from Proto-Indo-European *kei-, Dutch sein (Signal.)
*kei- (Proto-Indo-European)
sein (Dutch)
Signal.
signum (Latin)
(Medieval Latin) a signum (medieval tower bell used particularly for ringing the 8 canonical hours). A mark, sign, emblem. A miracle.
signo (Latin)
I mark, sign. I seal, stamp.
insigno (Latin)
(Vulgar Latin) I engrave.
insignare (Vulgar Latin)
insegnare (Italian)
(intransitive, to act as a teacher) to teach, to lecture. (transitive, to pass on knowledge) to teach.