The Collaborative International Dictionary of English v.0.48:

Adjacent \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.
   [1913 Webster]

   Adjacent or contiguous angle. (Geom.) See Angle.
      [1913 Webster]

   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.
          [1913 Webster] 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.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Adjacent \Ad*ja"cent\, n.
   That which is adjacent. [R.] --Locke.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Angle \An"gle\ ([a^][ng]"g'l), n. [F. angle, L. angulus angle,
   corner; akin to uncus hook, Gr. 'agky`los bent, crooked,
   angular, 'a`gkos a bend or hollow, AS. angel hook, fish-hook,
   G. angel, and F. anchor.]
   1. The inclosed space near the point where two lines meet; a
      corner; a nook.
      [1913 Webster]

            Into the utmost angle of the world.   --Spenser.
      [1913 Webster]

            To search the tenderest angles of the heart.
                                                  --Milton.
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   2. (Geom.)
      (a) The figure made by. two lines which meet.
      (b) The difference of direction of two lines. In the lines
          meet, the point of meeting is the vertex of the angle.
          [1913 Webster]

   3. A projecting or sharp corner; an angular fragment.
      [1913 Webster]

            Though but an angle reached him of the stone.
                                                  --Dryden.
      [1913 Webster]

   4. (Astrol.) A name given to four of the twelve astrological
      "houses." [Obs.] --Chaucer.
      [1913 Webster]

   5. [AS. angel.] A fishhook; tackle for catching fish,
      consisting of a line, hook, and bait, with or without a
      rod.
      [1913 Webster]

            Give me mine angle: we 'll to the river there.
                                                  --Shak.
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            A fisher next his trembling angle bears. --Pope.
      [1913 Webster]

   Acute angle, one less than a right angle, or less than
      90[deg].

   Adjacent or Contiguous angles, such as have one leg
      common to both angles.

   Alternate angles. See Alternate.

   Angle bar.
      (a) (Carp.) An upright bar at the angle where two faces of
          a polygonal or bay window meet. --Knight.
      (b) (Mach.) Same as Angle iron.

   Angle bead (Arch.), a bead worked on or fixed to the angle
      of any architectural work, esp. for protecting an angle of
      a wall.

   Angle brace, Angle tie (Carp.), a brace across an
      interior angle of a wooden frame, forming the hypothenuse
      and securing the two side pieces together. --Knight.

   Angle iron (Mach.), a rolled bar or plate of iron having
      one or more angles, used for forming the corners, or
      connecting or sustaining the sides of an iron structure to
      which it is riveted.

   Angle leaf (Arch.), a detail in the form of a leaf, more or
      less conventionalized, used to decorate and sometimes to
      strengthen an angle.

   Angle meter, an instrument for measuring angles, esp. for
      ascertaining the dip of strata.

   Angle shaft (Arch.), an enriched angle bead, often having a
      capital or base, or both.

   Curvilineal angle, one formed by two curved lines.

   External angles, angles formed by the sides of any
      right-lined figure, when the sides are produced or
      lengthened.

   Facial angle. See under Facial.

   Internal angles, those which are within any right-lined
      figure.

   Mixtilineal angle, one formed by a right line with a curved
      line.

   Oblique angle, one acute or obtuse, in opposition to a
      right angle.

   Obtuse angle, one greater than a right angle, or more than
      90[deg].

   Optic angle. See under Optic.

   Rectilineal or Right-lined angle, one formed by two right
      lines.

   Right angle, one formed by a right line falling on another
      perpendicularly, or an angle of 90[deg] (measured by a
      quarter circle).

   Solid angle, the figure formed by the meeting of three or
      more plane angles at one point.

   Spherical angle, one made by the meeting of two arcs of
      great circles, which mutually cut one another on the
      surface of a globe or sphere.

   Visual angle, the angle formed by two rays of light, or two
      straight lines drawn from the extreme points of an object
      to the center of the eye.

   For Angles of commutation, draught, incidence,
   reflection, refraction, position, repose, fraction,
      see Commutation, Draught, Incidence, Reflection,
      Refraction, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

adjacent
    adj 1: 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" [syn: adjacent, next, side by
           side(p)]
    2: having a common boundary or edge; abutting; touching; "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" [syn: adjacent, conterminous,
       contiguous, neighboring(a)]
    3: near or close to but not necessarily touching; "lands
       adjacent to the mountains"; "New York and adjacent cities"

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "adjacent":
   abutting, adjoining, attached, bordering, close-by, closest,
   connected, connecting, consecutive, conterminous, contiguous,
   coterminous, end to end, endways, endwise, face to face, handy,
   immediate, joined, juxtaposed, juxtapositional, juxtapositive,
   linked, nearby, nearest, neighbor, neighboring, next, successive,
   touching



The Free On-line Dictionary of Computing (30 December 2018):

adjacency
adjacent

    A relationship between two network devices,
   e.g. routers, which are connected by one media segment so
   that a packet sent by one can reach the other without going
   through another network device.  The concept of adjacency is
   important in the exchange of routing information.

   Adjacent SNA nodes are nodes connected to a given node
   with no intervening nodes.  In DECnet and OSI, adjacent
   nodes share a common segment (Ethernet, FDDI, Token
   Ring).

   (1998-03-10)