situated on or toward the outside; external; exterior: outer garments; an outer wall.
situated farther out or farther from the center: the outer reaches of space.
of or pertaining to the external world.

1350–1400; Middle English; see out, -er4

outerness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
outer (ˈaʊtə)
1.  being or located on the outside; external
2.  further from the middle or central part
3.  archery
 a.  the white outermost ring on a target
 b.  a shot that hits this ring
4.  (Austral) the unsheltered part of the spectator area at a sports ground
5.  informal (Austral), (NZ) on the outer excluded or neglected

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., comparative of out (on analogy of inner), replacing by 18c. forms descended from O.E. uttera (comp. of O.E. ut "out") which developed into utter and was no longer felt as connected with out. Outer space first attested 1901 in writings of H.G. Wells.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Align and add outer foot using two screws as shown above.
Cull your largest pods for the outer ring of the wreath.
Nearly every outer leaf makes its own flower, so the bigger the plant, the
  heavier the bloom.
Open the umbrella to determine the height of the outer rim.
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