WordNet sense 1 (the line that appears to bound an object):

lineation

WordNet sense 2 (a sketchy summary of the main points of an argument or theory):

abstract, precis, synopsis, abstract

WordNet sense 3 (a schematic or preliminary plan):

scheme, schema

WordNet sense 4 (trace the shape of):

delineate, limn

WordNet sense 5 (draw up an outline or sketch for something):

draft

WordNet sense 6 (describe roughly or briefly or give the main points or summary of):

adumbrate, sketch