The Collaborative International Dictionary of English v.0.48:

Border \Bor"der\, v. t.
   1. To make a border for; to furnish with a border, as for
      ornament; as, to border a garment or a garden.
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   2. To be, or to have, contiguous to; to touch, or be touched,
      as by a border; to be, or to have, near the limits or
      boundary; as, the region borders a forest, or is bordered
      on the north by a forest.
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            The country is bordered by a broad tract called the
            "hot region."                         --Prescott.
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            Shebah and Raamah . . . border the sea called the
            Persian gulf.                         --Sir W.
                                                  Raleigh.
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   3. To confine within bounds; to limit. [Obs.]
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            That nature, which contemns its origin,
            Can not be bordered certain in itself. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Border \Bor"der\, n. [OE. bordure, F. bordure, fr. border to
   border, fr. bord a border; of German origin; cf. MHG. borte
   border, trimming, G. borte trimming, ribbon; akin to E. board
   in sense 8. See Board, n., and cf. Bordure.]
   1. The outer part or edge of anything, as of a garment, a
      garden, etc.; margin; verge; brink.
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            Upon the borders of these solitudes.  --Bentham.
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            In the borders of death.              --Barrow.
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   2. A boundary; a frontier of a state or of the settled part
      of a country; a frontier district.
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   3. A strip or stripe arranged along or near the edge of
      something, as an ornament or finish.
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   4. A narrow flower bed.
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   Border land, land on the frontiers of two adjoining
      countries; debatable land; -- often used figuratively; as,
      the border land of science.

   The Border, The Borders, specifically, the frontier
      districts of Scotland and England which lie adjacent.

   Over the border, across the boundary line or frontier.
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   Syn: Edge; verge; brink; margin; brim; rim; boundary;
        confine.
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The Collaborative International Dictionary of English v.0.48:

Border \Bor"der\, v. i. [imp. & p. p. Bordered; p. pr. & vb.
   n. Bordering.]
   1. To touch at the edge or boundary; to be contiguous or
      adjacent; -- with on or upon as, Connecticut borders on
      Massachusetts.
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   2. To approach; to come near to; to verge.
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            Wit which borders upon profaneness deserves to be
            branded as folly.                     --Abp.
                                                  Tillotson.
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WordNet (r) 3.0 (2006):

border
    n 1: a line that indicates a boundary [syn: boundary line,
         border, borderline, delimitation, mete]
    2: the boundary line or the area immediately inside the boundary
       [syn: margin, border, perimeter]
    3: the boundary of a surface [syn: edge, border]
    4: a decorative recessed or relieved surface on an edge [syn:
       molding, moulding, border]
    5: a strip forming the outer edge of something; "the rug had a
       wide blue border"
    v 1: extend on all sides of simultaneously; encircle; "The
         forest surrounds my property" [syn: surround, environ,
         ring, skirt, border]
    2: form the boundary of; be contiguous to [syn: bound,
       border]
    3: enclose in or as if in a frame; "frame a picture" [syn:
       frame, frame in, border]
    4: provide with a border or edge; "edge the tablecloth with
       embroidery" [syn: border, edge]
    5: lie adjacent to another or share a boundary; "Canada adjoins
       the U.S."; "England marches with Scotland" [syn: border,
       adjoin, edge, abut, march, butt, butt against,
       butt on]

Moby Thesaurus II by Grady Ward, 1.0:

245 Moby Thesaurus words for "border":
   Berlin wall, Japanese garden, Pillars of Hercules, abut, abut on,
   act drop, adjoin, alpine garden, ambit, approach, approximate,
   arboretum, arena, asbestos, asbestos board, backdrop, bailiwick,
   bamboo curtain, bank, batten, be contiguous, be in contact, beam,
   beat, bed, befringe, beginning, bind, binding, board, bog garden,
   border ground, border on, borderland, borderline, borders, bordure,
   botanical garden, bound, boundary, bounds, brim, brink, broadside,
   brow, butt, cheek, chop, circle, circuit, circumference,
   circumscribe, cloth, coast, communicate, compare, confine,
   confines, conjoin, connect, contour, cortex, coulisse,
   counterweight, covering, crust, curtain, curtain board, cyclorama,
   dado, decor, define, delineate, demesne, department, domain,
   dominion, door, drop, drop curtain, dry garden, edge, edging,
   encircle, enclose, end, enframe, entrance, envelope, epidermis,
   exterior, external, extremity, facade, face, facet, featheredge,
   field, fire curtain, flange, flank, flat, flipper, flower bed,
   flower garden, frame, frieze, fringe, front, frontier,
   frontier post, garden, garden spot, grape ranch, grapery, hand,
   handedness, hanging, haunch, hem, hemisphere, herbarium, hip,
   hortus siccus, integument, iron curtain, jardin, join, jowl,
   judicial circuit, jurisdiction, kitchen garden, labellum, labium,
   labrum, lap, laterality, ledge, lie by, limb, limbus, limit,
   limits, line, lineaments, lines, lip, list, many-sidedness, march,
   marches, marchland, marge, margin, marginate, mark off,
   market garden, metes and bounds, multilaterality, near, neighbor,
   orb, orbit, ornamental garden, outer face, outer layer, outer side,
   outer skin, outline, outpost, outside, outskirts, pale, paradise,
   perimeter, periphery, pinetum, planking, precinct, profile,
   province, purfle, purl, quarter, rag, ragged edge, realm, rim,
   rind, rock garden, roof garden, round, scene, scenery, screen,
   selvage, set off, shell, shore, shrubbery, side, side scene,
   sideline, siding, skin, skirt, sphere, stage screw, stand by,
   sunken garden, superficies, superstratum, surface, surround, tab,
   tableau, tea garden, teaser, temple, termination, three-mile limit,
   threshold, top, tormentor, touch, transformation,
   transformation scene, trench, trim, trimming, truck garden,
   twelve-mile limit, unilaterality, vegetable garden, verge,
   verge upon, victory garden, vinery, vineyard, wainscot,
   wainscoting, walk, wing, wingcut, woodcut