WordNet sense 1 (the United States federal department charged with conservation and the development of natural resources; created in 1849):

DoI, Department of the Interior, Interior Department

WordNet sense 2 (inside the country):

home, national

WordNet sense 3 (of concern to or concerning the internal affairs of a nation):

domestic

WordNet sense 4 (being or applying to the inside of a building):

inside

WordNet sense 5 (relating to or existing in the mind or thoughts):

inward

WordNet sense 6 (happening or arising or located within some limits or especially surface):

internal

WordNet sense 7 (located inward):

inner

WordNet sense 8 (of or coming from the middle of a region or country):

midland, upcountry

WordNet sense 9 (situated away from an area's coast or border):

inland