of mat-the act of interweaving or tangling together so as to make a mat; the process of becoming matted.-mats, in general, or collectively; mat work; a matlike fabric, for use in covering floors, packing articles, and the like; a kind of carpeting made of straw, etc.-materials for mats.-an ornamental border. see 3d mat, 4.-a dull, lusterless surface in certain of the arts, as gilding, metal work, glassmaking, etc.