The Collaborative International Dictionary of English v.0.48:

Vicinity \Vi*cin"i*ty\ (v[i^]*s[i^]n"[i^]*t[y^]; 277), n. [L.
   vicinitas, from vicinus neighboring, near, from vicus a row
   of houses, a village; akin to Gr. o'i^kos a house, Skr.
   v[=e][,c]a a house, vi[,c] to enter, Goth. weihs town: cf.
   OF. vicinit['e]. Cf. Diocese, Economy, Parish,
   Vicinage, Wick a village.]
   [1913 Webster]
   1. The quality or state of being near, or not remote;
      nearness; propinquity; proximity; as, the value of the
      estate was increased by the vicinity of two country seats.
      [1913 Webster]

            A vicinity of disposition and relative tempers.
                                                  --Jer. Taylor.
      [1913 Webster]

   2. That which is near, or not remote; that which is adjacent
      to anything; adjoining space or country; neighborhood.
      "The vicinity of the sun." --Bentley.
      [1913 Webster]

   Syn: Neighborhood; vicinage. See Neighborhood.
        [1913 Webster]

WordNet (r) 3.0 (2006):

vicinity
    n 1: a surrounding or nearby region; "the plane crashed in the
         vicinity of Asheville"; "it is a rugged locality"; "he
         always blames someone else in the immediate neighborhood";
         "I will drop in on you the next time I am in this neck of
         the woods" [syn: vicinity, locality, neighborhood,
         neighbourhood, neck of the woods]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "vicinity":
   airspace, alentours, ambience, ambit, approach, approximation,
   area, belt, borderlands, circle, circuit, circumambiencies,
   circumjacencies, circumstances, closeness, compass, confines,
   context, continental shelf, convergence, corridor, country,
   department, district, division, entourage,
   environing circumstances, environment, environs, extent,
   foreground, gestalt, ground, habitat, heartland, hinterland,
   immediacy, immediate foreground, land, locale, locality, magnitude,
   matter, milieu, nearness, neighborhood, nighness, offshore rights,
   outposts, outskirts, part, parts, perimeter, periphery, place,
   precinct, precincts, premises, propinquity, proximity, purlieus,
   quarter, range, region, salient, section, situation, soil, space,
   suburbs, surroundings, terrain, territory, three-mile limit,
   total environment, tune, twelve-mile limit, vicinage, zone