delimit

The Comoe River clearly delimits part of the northeastern frontier between Ivory Coast and Burkina Faso -- but the land border is poorly demarcated.

The phenomenon in which an initial antibody response to a virus dominates and delimits the response to later strains of the same virus is called "immunological imprinting," or "original antigenic sin."

He rebutted Maduro’s description of oil concessions granted by Guyana as being “in a maritime area yet to be delimited.”

One can see this playing out today in the rules for citizenship, voting and other mechanisms that serve to define and delimit participation in democratic politics.

One task will be delimiting the ocean, which some researchers think could exist in multiple layers, separated by high-pressure species of ice.