scission (n.)

"act of cutting or dividing," mid-15c., from French scission (14c.), from Late Latin scissionem (nominative scissio) "a cleaving, dividing," noun of action from past-participle stem of Latin scindere "to cut, rend, tear asunder, split; split up, part, divide, separate" (from PIE *skind-, from root *skei- "to cut, split").