Meaning of “mat” - Learner’s Dictionary

mat

noun [ C ] uk us /mæt/
FLOOR

a piece of thick material that you put on the floor, often in order to protect it:

There's a mat by the door for you to wipe your feet on.
TABLE

a small piece of plastic or other material that you put on a table so that hot plates and liquid will not damage it

(Definition of “mat” from the Cambridge Learner’s Dictionary © Cambridge University Press)