The Collaborative International Dictionary of English v.0.48:

Sectional \Sec"tion*al\, a.
   1. Of or pertaining to a section or distinct part of larger
      body or territory; local.
      [1913 Webster]

            All sectional interests, or party feelings, it is
            hoped, will hereafter yield to schemes of ambition.
                                                  --Story.
      [1913 Webster]

   2. Consisting of sections, or capable of being divided into
      sections; as, a sectional steam boiler.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sectional
    adj 1: relating to or based upon a section (i.e. as if cut
           through by an intersecting plane); "a sectional view";
           "sectional drawings"
    2: consisting of or divided into sections; "a sectional sofa";
       "sectioned plates" [syn: sectional, sectioned]
    3: related or limited to a distinct region or subdivision of a
       territory or community or group of people; "sectional
       tensions arose over slavery"
    n 1: a piece of furniture made up of sections that can be
         arranged individually or together

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "sectional":
   areal, denominational, factional, fractional, fragmentary,
   geographical, incomplete, interested, locational, part, partial,
   partisan, party, regional, sectarian, sectary, segmental,
   segmentary, territorial, topographic, zonal