Comprehensive
Dictionary Suite
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mat1 a piece of material, esp. a strong carpet fabric such as wool, that is used as a covering to protect a floor or other surface. [7 definitions]
mat2 a piece of cardboard or other stiff material that acts as a frame for a picture or as a border between a picture and its frame. [2 definitions]
mat3 variant of matte.
matte having a finish lacking in shine and luster; dull. [3 definitions]