Dae·jeon (d?-jôn?) also Tae·jon (t?-) A city of central South Korea south-southeast of Seoul. It is an agricultural center and a railroad hub.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.