From WordNet (r) 3.0 (2006):
mat
adj 1: not reflecting light; not glossy; "flat wall paint"; "a
photograph with a matte finish" [syn: flat, mat,
matt, matte, matted]
n 1: a thick flat pad used as a floor covering
2: mounting consisting of a border or background for a picture
[syn: mat, matting]
3: sports equipment consisting of a piece of thick padding on
the floor for gymnastic sports [syn: mat, gym mat]
4: a mass that is densely tangled or interwoven; "a mat of weeds
and grass"
5: a master's degree in teaching [syn: Master of Arts in
Teaching, MAT]
6: the property of having little or no contrast; lacking
highlights or gloss [syn: flatness, lusterlessness,
lustrelessness, mat, matt, matte]
7: a small pad of material that is used to protect surface from
an object placed on it
v 1: twist together or entwine into a confusing mass; "The child
entangled the cord" [syn: entangle, tangle, mat,
snarl] [ant: disentangle, straighten out, unsnarl]
2: change texture so as to become matted and felt-like; "The
fabric felted up after several washes" [syn: felt, felt
up, mat up, matt-up, matte up, matte, mat]