Tewkes·bur·y (to?oks?b?r??, -b?-r?, -br?, tyo?oks?-) A borough of west-central England on the Severn River north-northeast of Gloucester. Yorkist forces defeated the Lancastrians here (1471) in a major battle of the Wars of the Roses.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.Tewkesbury (?tju?ksb?r?; -br?) n (Placename) a town in W England, in N Gloucestershire at the confluence of the Rivers Severn and Avon: scene of a decisive battle (1471) of the Wars of the Roses in which the Yorkists defeated the Lancastrians; 12th-century abbey. Pop: 9978 (2001)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Tewkes?bur?y (?tuks?b?r i, -b? ri, -bri, ?tyuks-) n. a town in N Gloucestershire, in W England. 79,500. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.