Ogaden (?????d?n) n (Placename) the Ogaden a region of SE Ethiopia, bordering on Somalia: consists of a desert plateau, inhabited by Somali nomads; a secessionist movement, supported by Somalia, has existed within the region since the early 1960s and led to bitter fighting between Ethiopia and Somalia (1977?78)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014O?ga?den (o??g? de?n) n. an arid region in SE Ethiopia. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.