Pronunciation: (thrē'di-men'shu-nl, -dī-), [key]
1. having, or seeming to have, the dimension of depth as well as width and height.
2. (esp. in a literary work) fully developed: The story came alive chiefly because the characters were vividly three-dimensional.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.