tes·sel·late (t?s??-l?t?)tr.v. tes·sel·lat·ed, tes·sel·lat·ing, tes·sel·lates To form into a mosaic pattern, as by using small squares of stone or glass.[From Latin tessell?tus, of small square stones, from tessella, small cube, diminutive of tessera, a square; see tessera.]tes?sel·la?tion n.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.tessellation (?t?s??le???n) n1. the act of tessellating2. (Building) the form or a specimen of tessellated workCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tessellationdecoration composed of multi-colored, small tiles, as found in a mosaic.See also: Ornamentation-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.