Define Photo Mat

Mat definition is a piece of coarse woven plaited or felted fabric used especially as a floor covering or a support. How to use mat in a sentence. In the picture framing industry a mat or matte or mount in british english is a thin flat piece of paper based material included within a picture frame which serves as additional decoration and to perform several other more practical functions such as separating the art from the glass putting mats in a frame is called matting a term which can also usually be used interchangeably with mat.