The Collaborative International Dictionary of English v.0.48:

Interior \In*te"ri*or\, n.
   1. That which is within; the internal or inner part of a
      thing; the inside.
      [1913 Webster]

   2. The inland part of a country, state, or kingdom.
      [1913 Webster]

   Department of the Interior, that department of the
      government of the United States which has charge of
      pensions, patents, public lands and surveys, the Indians,
      education, etc.; that department of the government of a
      country which is specially charged with the internal
      affairs of that country; the home department.

   Secretary of the Interior, the cabinet officer who, in the
      United States, is at the head of the Department of the
      Interior.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Interior \In*te"ri*or\, a. [L., compar. fr. inter between: cf.
   F. int['e]rieur. See Inter-, and cf. Intimate.]
   [1913 Webster]
   1. Being within any limits, inclosure, or substance; inside;
      internal; inner; -- opposed to exterior, or
      superficial; as, the interior apartments of a house; the
      interior surface of a hollow ball.
      [1913 Webster]

   2. Remote from the limits, frontier, or shore; inland; as,
      the interior parts of a region or country.
      [1913 Webster]

   Interior angle (Geom.), an angle formed between two sides,
      within any rectilinear figure, as a polygon, or between
      two parallel lines by these lines and another intersecting
      them; -- called also internal angle.

   Interior planets (Astron.), those planets within the orbit
      of the earth.

   Interior screw, a screw cut on an interior surface, as in a
      nut; a female screw.

   Syn: Internal; inside; inner; inland; inward.
        [1913 Webster]

WordNet (r) 3.0 (2006):

interior
    adj 1: situated within or suitable for inside a building; "an
           interior scene"; "interior decoration"; "an interior
           bathroom without windows" [ant: exterior]
    2: inside the country; "the British Home Office has broader
       responsibilities than the United States Department of the
       Interior"; "the nation's internal politics" [syn: home(a),
       interior(a), internal, national]
    3: located inward; "Beethoven's manuscript looks like a bloody
       record of a tremendous inner battle"- Leonard Bernstein; "she
       thinks she has no soul, no interior life, but the truth is
       that she has no access to it"- David Denby; "an internal
       sense of rightousness"- A.R.Gurney,Jr. [syn: inner,
       interior, internal]
    4: inside and toward a center; "interior regions of the earth"
    5: of or coming from the middle of a region or country;
       "upcountry districts" [syn: interior, midland,
       upcountry]
    n 1: the region that is inside of something [syn: inside,
         interior] [ant: exterior, outside]
    2: the inner or enclosed surface of something [syn: inside,
       interior] [ant: exterior, outside]
    3: the United States federal department charged with
       conservation and the development of natural resources;
       created in 1849 [syn: Department of the Interior, Interior
       Department, Interior, DoI]

Moby Thesaurus II by Grady Ward, 1.0:

126 Moby Thesaurus words for "interior":
   airscape, amidships, anonymous, average, belly, bosom, center,
   central, cityscape, civil, closet, cloudscape, core, deep,
   deepest recesses, depths, diameter, diaphragm, diorama, domestic,
   equator, equatorial, equidistant, exterior, farmscape, gut,
   halfway, heart, heart of hearts, heartland, hidden, hinterland,
   home, incognito, individual, indoor, inland, inlands, inmost,
   innards, inner, inner landscape, inner life, inner man,
   inner nature, inner recess, inner self, innermost, inshore, inside,
   interior man, intermediary, intermediate, intern, internal,
   internals, intestine, intimate, intrados, intrinsic, inward,
   inwards, isolated, kernel, landscape, local, mean, medial, median,
   mediocre, mediterranean, medium, mesial, mezzo, mid, middle,
   middlemost, middling, midland, midlands, midmost, midriff,
   midships, midst, midway, national, nuclear, nucleus, pastoral,
   penetralia, personal, private, privy, recesses, retired,
   riverscape, scape, scene, seapiece, seascape, secluded, secret,
   secret place, secret places, sequestered, skyscape, snowscape,
   soul, thick, thick of things, townscape, up-country, upland,
   uplands, veiled, view, viscera, visceral, vital center, vitals,
   waist, waistline, waterscape, withdrawn, within, zone



U.S. Gazetteer Places (2000):

Interior, SD -- U.S. town in South Dakota
   Population (2000):    77
   Housing Units (2000): 53
   Land area (2000):     1.344865 sq. miles (3.483183 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.344865 sq. miles (3.483183 sq. km)
   FIPS code:            31620
   Located within:       South Dakota (SD), FIPS 46
   Location:             43.725197 N, 101.983114 W
   ZIP Codes (1990):     57750
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Interior, SD
    Interior