Source : Webster's Revised Unabridged Dictionary (1913)

Interior \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.

Source : WordNet®

Secretary of the Interior
     n 1: the position of the head of the Department of the Interior;
          "the position of Interior Secretary was created in 1849"
          [syn: {Interior Secretary}]
     2: the person who holds the secretaryship of the Interior
        Department; "President Taylor appointed Thomas Ewing as
        the first Secretary of the Interior" [syn: {Interior
        Secretary}]