The Collaborative International Dictionary of English v.0.48:

Contiguous \Con*tig"u*ous\, a. [L. contiguus; akin to contigere
   to touch on all sides. See Contingent.]
   In actual contact; touching; also, adjacent; near;
   neighboring; adjoining.
   [1913 Webster]

         The two halves of the paper did not appear fully
         divided . . . but seemed contiguous at one of their
         angles.                                  --Sir I.
                                                  Newton.
   [1913 Webster]

         Sees no contiguous palace rear its head. --Goldsmith.
   [1913 Webster]

   Contiguous angles. See Adjacent angles, under Angle.

   Syn: Adjoining; adjacent. See Adjacent. --
        Con*tig"u*ous*ly, adv. -- Con*tig"u*ous*ness, n.
        [1913 Webster] Continence

WordNet (r) 3.0 (2006):

contiguousness
    n 1: the attribute of being so near as to be touching [syn:
         adjacency, contiguity, contiguousness]