The Collaborative International Dictionary of English v.0.48:

Midland \Mid"land\, a.
   1. Being in the interior country; distant from the coast or
      seashore; as, midland towns or inhabitants. --Howell.
      [1913 Webster]

   2. Surrounded by the land; mediterranean.
      [1913 Webster]

            And on the midland sea the French had awed.
                                                  --Dryden.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Midland \Mid"land\, n.
   The interior or central region of a country; -- usually in
   the plural. --Drayton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

midland
    adj 1: of or coming from the middle of a region or country;
           "upcountry districts" [syn: interior, midland,
           upcountry]
    n 1: a town in west central Texas
    2: the interior part of a country