American English

Definition of outer adjective from the Oxford Advanced American Dictionary

      

    outer

     adjective
    adjective
    NAmE//ˈaʊt̮ər//
     
    [only before noun]
     
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  1. 1on the outside of something synonym external the outer layers of the skin
  2. 2 furthest from the inside or center of something I walked along the outer edge of the track. the outer suburbs of the city Outer Mongolia (figurative) to explore the outer (= most extreme) limits of human experience opposite inner
See the Oxford Advanced Learner's Dictionary entry: outer