1. [n]  the outer side or surface of something
2. [n]  the region that is outside of something
3. [adj]  situated in or suitable for the outdoors or outside of a building; "an exterior scene"; "exterior grade plywood"; "exterior paints"

Exterior
Exterior

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1. \Ex*te"ri*or\, a. [L. exterior, compar. of exter or
   exterus on the outside, outward, foreign, strange, a compar.
   fr. ex: cf. F. ext['e]rieur. See {Ex?}, and cf. {Extreme},
   {Interior}.]
   1. External; outward; pertaining to that which is external;
      -- opposed to interior; as, the exterior part of a sphere.
            Sith nor the exterior nor the inward man Resemble
            that it was.                          --Shak.
   2. External; on the outside; without the limits of;
      extrinsic; as, an object exterior to a man, opposed to
      what is within, or in his mind.
            Without exterior help sustained.      --Milton.
   3. Relating to foreign nations; foreign; as, the exterior
      relations of a state or kingdom.
   {Exterior angle} (Geom.), the angle included between any side
      of a triangle or polygon and the prolongation of the
      adjacent side; also, an angle included between a line
      crossing two parallel lines and either of the latter on
      the outside.
   {Exterior side} (Fort.), the side of the polygon upon which a
      front of fortification is formed. --Wilhelm.
   Note: See Illust. of {Ravelin}.
   

2. \Ex*te"ri*or\, n.
   1. The outward surface or part of a thing; that which is
      external; outside.
   2. Outward or external deportment, form, or ceremony; visible
      act; as, the exteriors of religion.