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Latin word scientia comes from Proto-Indo-European *sēik-, Proto-Indo-European *ski-, and later Latin scio (I can, know, understand, have knowledge.. I know carnally.)
*sēik- (Proto-Indo-European)
to cut
*ski- (Proto-Indo-European)
*skijō (Proto-Italic)
scio (Latin)
I can, know, understand, have knowledge.. I know carnally.
scientia (Latin)
Knowledge.