Delineate
Etymology
From Latin “delineare,” to sketch out in outline, from “de-” and “linea,” a line. To delineate was first to render a thing in lines, as a draftsman does. The figurative sense keeps the edge-drawing: to delineate responsibilities is to say precisely where one person’s end and another’s begin.
verb · /dih-LIN-ee-ayt/
To describe or mark out the exact boundaries of something.
What it names
Precise definition — drawing the line that says what is inside a category and what falls outside it.
Example
The contract carefully delineates which party bears the cost when a shipment is delayed.
Related idea
To delineate is to draw the boundary; to subsume is to place one thing inside another’s boundary. You delineate two roles, or you subsume one under the other.