plat 1 (pl?t)tr.v. plat·ted, plat·ting, plats To plait or braid.n. A braid.[Middle English platen, alteration of plaiten, to fold, braid; see plait.]plat 2 (pl?t)n.1. A piece of land; a plot.2. A map showing actual or planned features, such as streets and building lots.tr.v. plat·ted, plat·ting, plats To make a plat of: plat a new town.[Middle English, probably alteration (influenced by plat, something flat) of plot; see plot.]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.plat (plæt) na small area of ground; plot[C16 (also occurring in Middle English in place names): originally variant of plot2]plat (plæt) n, vb, plats, platting or platted (Hairdressing & Grooming) a variant spelling of plait[C16: variant of plait]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014plat1 (plæt) n., v. plat?ted, plat?ting. n. 1. a plot of ground. 2. a plan or map, as of land. v.t. 3. to make a plat of. [1400?50; late Middle English; variant of plot, reinforced by Middle English plat flat of a sword