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Midlothian(mĭdlō`thēən), council area (1993 est. pop. 79,910), 137 sq mi (356 sq km), and former county, SE Scotland. Under the Local Government Act of 1973, Midlothian was divided between the former Lothian and Borders regions in 1975. In the local government reorganization of 1996, Lothian was dissolved and the council area of Midlothian was created from part of the former territory of the county of Midlothian. The county of Midlothian was formerly known as Edinburgh or Edinburghshire.
a council area of SE central Scotland: the historical county of Midlothian (including Edinburgh) became part of Lothian region in 1975; separate unitary authorities were created for Midlothian and City of Edinburgh in 1996; mainly agricultural. Administrative centre: Dalkeith. Pop.: 79 710 (2003 est.). Area: 356 sq. km (137 sq. miles)