The Collaborative International Dictionary of English v.0.48:

Outside \Out"side`\, a.
   1. Of or pertaining to the outside; external; exterior;
      superficial.
      [1913 Webster]

   2. Reaching the extreme or farthest limit, as to extent,
      quantity, etc.; as, an outside estimate. [Colloq.]
      [1913 Webster]

   Outside finish (Arch.), a term for the minor parts, as
      corner boards, hanging stiles, etc., required to complete
      the exterior of a wooden building; -- rare in masonry.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Outside \Out"side`\, n.
   1. The external part of a thing; the part, end, or side which
      forms the external surface; that which appears, or is
      manifest; that which is superficial; the exterior.
      [1913 Webster]

            There may be great need of an outside where there is
            little or nothing within.             --South.
      [1913 Webster]

            Created beings see nothing but our outside.
                                                  --Addison.
      [1913 Webster]

   2. The part or space which lies beyond the external edge of a
      structure or beyond the boundary of an inclosure.
      [1913 Webster +PJC]

            I threw open the door of my chamber, and found the
            family standing on the outside.       --Spectator.
      [1913 Webster]

   3. The furthest limit, as to number, quantity, extent, etc.;
      the utmost; as, it may last a week at the outside.
      [1913 Webster]

   4. One who, or that which, is without; hence, an outside
      passenger, as distinguished from one who is inside. See
      Inside, n. 3. [Colloq. Eng.]
      [1913 Webster]

   5. The part of the world not encompassed by or under control
      of an organization or institution; as, prisoners are not
      allowed to pass objects to persons on the outside; one may
      not discuss company secretes with anyone on the outside.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Outside \Out"side`\, adv. or prep.
   On or to the outside (of); without; on the exterior; as, to
   ride outside the coach; he stayed outside.
   [1913 Webster]

WordNet (r) 3.0 (2006):

outside
    adv 1: outside a building; "in summer we play outside" [syn:
           outside, outdoors, out of doors, alfresco] [ant:
           indoors, inside]
    2: on the outside; "outside, the box is black" [ant: inside,
       within]
    adj 1: relating to or being on or near the outer side or limit;
           "an outside margin" [ant: inside]
    2: coming from the outside; "extraneous light in the camera
       spoiled the photograph"; "relying upon an extraneous income";
       "disdaining outside pressure groups" [syn: external,
       extraneous, outside]
    3: originating or belonging beyond some bounds:"the outside
       world"; "outside interests"; "an outside job"
    4: located, suited for, or taking place in the open air;
       "outdoor clothes"; "badminton and other outdoor games"; "a
       beautiful outdoor setting for the wedding" [syn:
       outdoor(a), out-of-door, outside] [ant: indoor(a)]
    5: functioning outside the boundaries or precincts of an
       organized unit; "extramural hospital care and treatment";
       "extramural studies"
    6: leading to or from the outside; "an outside door"
    7: from or between other countries; "external commerce";
       "international trade"; "developing nations need outside help"
       [syn: external, international, outside(a)]
    8: very unlikely; "an outside chance"; "a remote possibility";
       "a remote contingency" [syn: outside, remote]
    9: on or toward an outer edge; "an outer lane"; "the outside
       lane"
    10: (of a baseball pitch) on the far side of home plate from the
        batter; "the pitch was away (or wide)"; "an outside pitch"
        [syn: away, outside]
    n 1: the region that is outside of something [syn: outside,
         exterior] [ant: inside, interior]
    2: the outer side or surface of something [syn: outside,
       exterior] [ant: inside, interior]

Moby Thesaurus II by Grady Ward, 1.0:

151 Moby Thesaurus words for "outside":
   abroad, after, alfresco, alien, apart from, apparent, apparently,
   appearance, aside from, aspect, bar, barbarian, barbaric,
   barbarous, beside, best, border, but, case, casing, circumference,
   cortex, cortical, cottage, covering, crust, demeanor, different,
   disguise, door, en plein air, envelope, epidermic, epidermis,
   excluded, exclusive of, exomorphic, exotic, exterior, exteriorly,
   external, externally, extraneous, extraorganismal,
   extraterrestrial, extreme, extrinsic, facade, face, facet, facing,
   faint, false front, farthest, fat, foreign, foreign-born,
   freelance, fringe, front, furthest, greatest, highest, home,
   impersonal, in the open, independent, integument, intrusive,
   largest, limit, lineaments, longest, look, mask, maximal, maximum,
   mien, most, negligible, nonsubjective, objective, off,
   on the outside, on the surface, open, open air, open-air, openly,
   out, out of doors, out-of-door, out-of-doors, outdoor, outdoors,
   outer, outer face, outer layer, outer side, outer skin, outermost,
   outland, outlandish, outline, outlying, outmost, outstanding,
   outward, outward-facing, outwardly, outwards, over, past,
   peripheral, periphery, private, public, publically, remote, rind,
   roundabout, save, saving, secondary, seeming, separate, shell,
   skin, slender, slight, slim, small, strange, superficial,
   superficially, superficies, superstratum, surface, the open,
   the out-of-doors, to all appearances, top, topmost, ulterior,
   unconnected, unearthly, uninvolved, unlikely, utmost, without,
   worst