a former administrative county in southeastern Wales.
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British Dictionary definitions for South Glamorgan
a former county of S Wales, formed in 1974 from parts of Glamorgan and Monmouthshire plus the county borough of Cardiff: replaced in 1996 by the county boroughs of Cardiff and Vale of Glamorgan
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012