Definition of interior noun from the Oxford Advanced American Dictionary

      

    interior

     noun
    noun
    NAmE//ɪnˈtɪriər//
     
     
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  1. 1[countable, usually singular] the inside part of something the interior of a building/a car opposite exterior
  2. 2the interior [singular] the central part of a country or continent that is a long way from the coast an expedition into the interior of Australia
  3. 3 the Interior [singular] a country's own affairs rather than those that involve other countries the Department/Secretary of the Interior
See the Oxford Advanced Learner's Dictionary entry: interior