Webster's Revised Unabridged Dictionary · 1913

Exterior

Exterior , adjective

[Latin exterior, compar. of exter or exterus on the outside, outward, foreign, strange, a compar. from ex: compare French extérieur. See Ex-, and compare 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. — Shakespeare
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.
Collocations (2)
Exterior angle (Geometry) , 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 (Fortification) , the side of the polygon upon which a front of fortification is formed. — Wilhelm

See Illust. of Ravelin.

Exterior , noun

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.