1. [adj]  near or close to but not necessarily touching; "lands adjacent to the mountains"; "New York and adjacent cities"
2. [adj]  nearest in space or position; immediately adjoining without intervening space; "had adjacent rooms"; "in the next room"; "the person sitting next to me"; "our rooms were side by side"
3. [adj]  having a common boundary or edge; touching; "abutting lots"; "adjoining rooms"; "Rhode Island has two bordering states; Massachusetts and Conncecticut"; "the side of Germany conterminous with France"; "Utah and the contiguous state of Idaho"; "neighboring cities"

1. \Ad*ja"cent\, a. [L. adjacens, -centis, p. pr. of
   adjacere to lie near; ad + jac[=e]re to lie: cf. F.
   adjacent.]
   Lying near, close, or contiguous; neighboring; bordering on;
   as, a field adjacent to the highway. ``The adjacent forest.''
   --B. Jonson.
   {Adjacent} or {contiguous angle}. (Geom.) See {Angle}.
   Syn: Adjoining; contiguous; near.
   Usage: {Adjacent}, {Adjoining}, {Contiguous}. Things are
          adjacent when they lie close each other, not necessary
          in actual contact; as, adjacent fields, adjacent
          villages, etc.
                I find that all Europe with her adjacent isles
                is peopled with Christians.       --Howell.
          Things are adjoining when they meet at some line or
          point of junction; as, adjoining farms, an adjoining
          highway. What is spoken of as contiguous should touch
          with some extent of one side or the whole of it; as, a
          row of contiguous buildings; a wood contiguous to a
          plain.
   

2. \Ad*ja"cent\, n.
   That which is adjacent. [R.] --Locke.
   

adjacency