Where does “dimidiatio” come from?

dimidiatio (Late Latin) comes from Latin dimidio, from Latin dimidius, from Latin medius, from Latin locus, from Old Latin stlocus, from Proto-Italic stlokos, from Proto-Indo-European stel- — to put, to place; to locate.

dimidiatio (Late Latin): a halving, a dividing into halves; a dimidiation