Source : Webster's Revised Unabridged Dictionary (1913)

Scission \Scis"sion\, n. [L. scissio, fr. scindere, scissum, to
   cut, to split: cf. F. scission.]
   The act of dividing with an instrument having a sharp edge.
   --Wiseman.

Source : WordNet®

scission
     n : the act of dividing by cutting or splitting