I have no idea unless they are something like the dementors that guard Azkaban. Now if you actually meant "dimensions" then it is the number of rows and number of columns. An m-by-n matrix has m rows and n columns.
Just curious: Did you ever have a teacher that told you spelling didn't matter? If you did, go find him/her and tell him/her that you want your money back. All of it. Right now.
John
My calculator said it, I believe it, that settles it
