Definition of inside preposition from the Oxford Advanced American Dictionary

      

    inside

     preposition
    preposition
    NAmE//ˌɪnˈsaɪd//
     
    , NAmE//ˈɪnsaɪd//
     
    (also inside of)
     
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  1. 1on or to the inner part of something or someone; within something or someone Go inside the house. Inside the box was a gold watch. For years we had little knowledge of what life was like inside China. You'll feel better with a good meal inside you. (figurative) Inside most of us is a small child screaming for attention. opposite outside
  2. 2in less than the amount of time mentioned The job is unlikely to be finished inside (of) a year
See the Oxford Advanced Learner's Dictionary entry: inside