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Meaning of three-dimensional

three-di•men•sion•al

Pronunciation: (thrē'di-men'shu-nl, -dī-), [key]
— adj.
  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.