Aa·chen (ä?k?n, ä?KH?n) also Aix-la-Cha·pelle (?ks?lä-sh?-p?l?, ?ks?-) A city of western Germany near the Belgian and Dutch borders. Charlemagne may have been born here in 742; he later made the city his northern capital.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Aachen (???k?n; German ?a?x?n) n (Placename) a city and spa in W Germany, in North Rhine-Westphalia: the northern capital of Charlemagne’s empire. Pop: 256 605 (2003 est). French name: Aix-la-Chapelle Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Aa?chen (?? k?n, ?? x?n) n. a city in W Germany, near Belgian and Dutch borders. 247,113. French, Aix-la-Chapelle. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.