English

Definition of inside preposition from the Oxford Advanced Learner's Dictionary

      

    inside

     preposition
    preposition
    BrE BrE//ˌɪnˈsaɪd//
     
    ; NAmE NAmE//ˌɪnˈsaɪd//
     
    (also inside of especially in North American English)
     
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  1. 1  on or to the inner part of something/somebody; within something/somebody 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
  3. Word Origin late Middle English (denoting the interior of the body): from in + side.
See the Oxford Advanced American Dictionary entry: inside