demarcate

To mark the limits or boundaries of something; to delimit.

Small Committees of officials are frequently appointed in advance to consider the geographical, topographical, and ethnological evidence that is forthcoming, and to construct a tentative line for their respective Governments; this, after much debate, is embodied in a treaty, which provides for the appointment of Commissioners to demarcate the line upon the spot and submit it for ratification by the principals.

To mark the difference between two causes of action; to distinguish.