Synonyms for Delimit (same or very similar meaning)
WordNet sense 1 (be opposite to; of angles and sides, in geometry):
subtend
WordNet sense 2 (determine the essential quality of):
define, delineate, specify, delimitate
WordNet sense 3 (set, mark, or draw the boundaries of something):
demarcate
From the ODE community, based on WordNet
add/edit