Sokorul, please stop spamming serious threads...
American Heritage
1. The extent, measurement, or dimension downward, backward, or inward
Princeton
S: (n) depth, deepness (the extent downward or backward or inward)
I did not mean length and width. Depth and Width is fine. It denotes two dimensions that are infinite. It doesn't matter which two. Whether or not it has a surface is irrelevant.
Please stop with your inane and ultimately useless arguments attacking, ironically and hypocritically, grammar, word choice, and syntax rather than content. I don't even see why you are allowed here.