outer; being on the outer side: the exterior surface; exterior decorations.
intended or suitable for outdoor use: exterior paint.
situated or being outside; pertaining to or connected with what is outside: the exterior territories of a country.
the outer surface or part; outside.
outward form or appearance: She has a placid exterior, but inside she is tormented.
Mathematics. the collection of points not contained in the closure of a given set.

1525–35; < Latin, comparative of exter or exterus on the outside, outward. See ex-1

exteriorly, adverb

1. outward, outside, external, superficial. 3. outlying, extraneous, foreign; extrinsic. 4. face. 5. mien, aspect.

1, 4. interior.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
exterior (ɪkˈstɪərɪə)
1.  a part, surface, or region that is on the outside
2.  the observable outward behaviour or appearance of a person
3.  a film or scene shot outside a studio
4.  of, situated on, or suitable for the outside: exterior cleaning
5.  coming or acting from without; external: exterior complications
6.  of or involving foreign nations
[C16: from Latin, comparative of exterus on the outside, from ex out of]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1528, from L. exterior, comp. of exterus "outer," comp. of ex "out of."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Not to speak of the damage which is not visible in a standard view of the
  exterior of a car.
The inferior surface is rough and irregular, and forms part of the exterior of
  the base of the skull.
The historic interior and exterior need tending once again, to modernize
  utility systems and shore up walls and roofs.
It is as much a giant sculpture as a building, the zinc exterior sliced in
  dozens of seemingly random lines and geometric shapes.
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