In·chon (?n?ch?n?, -ch?n?) See Incheon.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.Inchon (??n?t??n) or Incheonn (Placename) a port in W South Korea, on the Yellow Sea: the chief port for Seoul: site of a major strategic amphibious assault by UN troops, liberating Seoul (Sept 15, 1950). Pop: 2 642 000 (2005 est). Former name: Chemulpo Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014In?chon (??n?t??n) n. a seaport in W South Korea. 2,307,618. Formerly, Chemulpo. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.