’twill (tw?l) contraction ofit willCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014twill (tw?l) n. 1. a weave in which the filling threads are woven over and under two or more warp yarns, producing a diagonal pattern. 2. a fabric with a twill weave. 3. a garment, as trousers, of this fabric. v.t. 4. to weave in the manner of a twill. 5. to weave in twill construction. [1300?50; north and Scots variant of twilly (n.), Middle English twyle, Old English twil?(c), half translation of Latin bil?c-, s. of bil?x having double thread. See twi-] ’twill (tw?l) contraction of it will. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.