Definition of outside noun from the Oxford Advanced American Dictionary

      

    outside

     noun
    noun
    NAmE//ˌaʊtˈsaɪd//
     
    , NAmE//ˈaʊtsaɪd//
     
     
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  1. 1the outside [countable, usually singular] the outer side or surface of something synonym exterior The outside of the house needs painting. You can't open the door from the outside.
  2. 2[singular] the area that is near or around a building, etc. I walked around the outside of the building. I didn't go into the temple—I only saw it from the outside.
  3. 3[singular] the part of a road nearest to the middle Always overtake on the outside.
  4. 4[singular] the part of a curving road or track furthest from the inner or shorter side of the curve opposite the inside
  5. Idioms
    at the outside
     
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    at the most; as a maximum There was room for 20 people at the outside.
      on the outside
       
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    1. 1used to describe how someone appears or seems On the outside she seems calm, but I know she's worried.
    2. 2not in prison Life on the outside took some getting used to again.
See the Oxford Advanced Learner's Dictionary entry: outside