The Collaborative International Dictionary of English v.0.48:

Delimit \De*lim"it\, v. t. [L. delimitare: cf. F. d['e]limiter.]
   To fix the limits of; to demarcate; to bound.
   [1913 Webster]

WordNet (r) 3.0 (2006):

delimit
    v 1: determine the essential quality of [syn: specify,
         define, delineate, delimit, delimitate]
    2: be opposite to; of angles and sides, in geometry [syn:
       subtend, delimit]
    3: set, mark, or draw the boundaries of something [syn:
       demarcate, delimit, delimitate]