[1] : The Collaborative International Dictionary of English v.0.48

exterior \exte"rior\, a. l. exterior, compar. of exter or
   exterus on the outside, outward, foreign, strange, a compar.
   fr. ex: cf. f. ext'erieur. 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.
      1913 webster

            sith nor the exterior nor the inward man
            resemble that it was.                 --shak.
      1913 webster

   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.
      1913 webster

            without exterior help sustained.      --milton.
      1913 webster

   3. relating to foreign nations; foreign; as, the exterior
      relations of a state or kingdom.
      1913 webster

   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.
      1913 webster

   note: see illust. of ravelin.
         1913 webster
see also:
ex- extreme interior interior exterior angle exterior side 
ravelin 

[2] : WordNet (r) 2.0

exterior angle
     n : the supplement of an interior angle of a polygon syn: external
         angle
see also:
external angle 

Angle >> A Words
Angle, definition of term: Angle
angle_pag1.html

Angle Bracket >> A Words
Angle Bracket, definition of term: Angle Bracket
angle+bracket_pag1.html

Angle Iron >> A Words
Angle Iron, definition of term: Angle Iron
angle+iron_pag1.html

Acute Angle >> A Words
Acute Angle, definition of term: Acute Angle
acute+angle_pag1.html

Dihedral Angle >> D Words
Dihedral Angle, definition of term: Dihedral Angle
dihedral+angle_pag1.html

Angle Of Attack >> A Words
Angle Of Attack, definition of term: Angle Of Attack
angle+of+attack_pag1.html

Angle Of Repose >> A Words
Angle Of Repose, definition of term: Angle Of Repose
angle+of+repose_pag1.html