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Latin word cum comes from Proto-Indo-European *ḱe, and later Proto-Indo-European *ḱóm (Beside, near, by, with.)
*ḱe (Proto-Indo-European)
*ḱóm (Proto-Indo-European)
Beside, near, by, with.
*kom (Proto-Italic)
(with ablative) with, along, at.
cum (Latin)
With.