In·te·ri·or, n.
 1. That which is within; the internal or inner part of a thing; the inside.
 2. The inland part of a country, state, or kingdom.
 Department of the Interior, that department of the government of the United States which has charge of pensions, patents, public lands and surveys, the Indians, education, etc.; that department of the government of a country which is specially charged with the internal affairs of that country; the home department.
 Secretary of the Interior, the cabinet officer who, in the United States, is at the head of the Department of the Interior.

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 Department of the Interior
      n : the United States federal department charged with
          conservation and the development of natural resources;
          created in 1849 [syn: Interior Department, Interior,
          DoI]