The Collaborative International Dictionary of English v.0.48:

Neighbor \Neigh"bor\, v. i.
   To dwell in the vicinity; to be a neighbor, or in the
   neighborhood; to be near. [Obs.]
   [1913 Webster]

         A copse that neighbors by.               --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Neighbor \Neigh"bor\ (n[=a]"b[~e]r), n. [OE. neighebour, AS.
   ne['a]hgeb[=u]r; ne['a]h nigh + geb[=u]r a dweller, farmer;
   akin to D. nabuur, G. nachbar, OHG. n[=a]hgib[=u]r. See
   Nigh, and Boor.] [Spelt also neighbour.]
   1. A person who lives near another; one whose abode is not
      far off. --Chaucer.
      [1913 Webster]

            Masters, my good friends, mine honest neighbors.
                                                  --Shak.
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   2. One who is near in sympathy or confidence.
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            Buckingham
            No more shall be the neighbor to my counsel. --Shak.
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   3. One entitled to, or exhibiting, neighborly kindness;
      hence, one of the human race; a fellow being.
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            Which now of these three, thinkest thou, was
            neighbor unto him that fell among the thieves?
                                                  --Luke x. 36.
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            The gospel allows no such term as "stranger;" makes
            every man my neighbor.                --South.
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The Collaborative International Dictionary of English v.0.48:

Neighbor \Neigh"bor\, a.
   Near to another; adjoining; adjacent; next; neighboring. "The
   neighbor cities." --Jer. l. 40. "The neighbor room." --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

neighbor \neigh"bor\, v. t. [imp. & p. p. Neighbored; p. pr. &
   vb. n Neighboring.]
   1. To adjoin; to border on; to be near to.
      [1913 Webster]

            Leisurely ascending hills that neighbor the shore.
                                                  --Sandys.
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   2. To associate intimately with. [Obs.] --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

neighbor
    n 1: a person who lives (or is located) near another [syn:
         neighbor, neighbour]
    2: a nearby object of the same kind; "Fort Worth is a neighbor
       of Dallas"; "what is the closest neighbor to the Earth?"
       [syn: neighbor, neighbour]
    v 1: live or be located as a neighbor; "the neighboring house"
         [syn: neighbor, neighbour]
    2: be located near or adjacent to; "Pakistan neighbors India"
       [syn: neighbor, neighbour]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "neighbor":
   abut, abut on, abutter, acquaintance, adjacent, adjoin, adjoiner,
   adjoining, advocate, alter ego, appose, backer, be contiguous,
   be in contact, best friend, border, border on, borderer, bordering,
   bosom friend, bring near, brother, butt, bystander,
   casual acquaintance, close acquaintance, close friend, communicate,
   confidant, confidante, conjoin, connect, connecting, conterminous,
   contiguous, coterminous, end to end, endways, endwise,
   face to face, familiar, favorer, fellow, fellow creature,
   fellowman, friend, immediate, immediate neighbor,
   inseparable friend, intimate, join, joined, juxtapose, juxtaposed,
   juxtaposit, juxtapositional, juxtapositive, lie by, line,
   looker-on, lover, march, neighborer, neighboring, next, onlooker,
   other self, partisan, pickup, put with, repository, stand by,
   supporter, sympathizer, tangent, touch, verge, verge upon,
   well-wisher



The Devil's Dictionary (1881-1906):

NEIGHBOR, n.  One whom we are commanded to love as ourselves, and who
does all he knows how to make us disobedient.