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Exterior

a.
  1. External; outward; pertaining to that which is external; -- opposed to interior; as, the exterior part of a sphere.
  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.
  3. Relating to foreign nations; foreign; as, the exterior relations of a state or kingdom.
    4. 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.

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.