con·vo·lu·tion (k?n?v?-lo?o?sh?n)n.1. A form or part that is folded or coiled.2. One of the convex folds of the surface of the brain.con?vo·lu?tion·al adj.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.convolution (?k?nv??lu???n) n1. a twisting together; a turn, twist, or coil2. an intricate, involved, or confused matter or condition3. (Anatomy) Also called: gyrus any of the numerous convex folds or ridges of the surface of the brain ?convo?lutional, ?convo?lutionary adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014con?vo?lu?tion (?k?n v??lu ??n) n. 1. a rolled up or coiled condition. 2. a rolling or coiling together. 3. a turn of anything coiled; whorl. 4. one of the sinuous folds or ridges of the surface of the brain. [1535?45;