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Narrower Term: 

n. ~ 1. A sheet of cardboard or other materials used in mounting flat items for storage or framing. - 2. A simple frame made from cardboard or other material.


A mat1 commonly has a solid back, on which the item is mounted, and a front with a window cut to allow the item to be viewed. - Mat2 refers to the sheet placed in front of the item; it is distinguished from the mount, which is the backing board to which the item is attached.