Dictionary.com
definitions

three-dimensional

[three-di-men-shuh-nl, -dahy-]
adjective
  1. having, or seeming to have, the dimension of depth as well as width and height.
  2. (especially in a literary work) fully developed: The story came alive chiefly because the characters were vividly three-dimensional.

Origin of three-dimensional

First recorded in 1890–95
Related formsthree·di·men·sion·al·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for three-dimensionality

three-dimensional

three-D or 3-D

adjective
  1. of, having, or relating to three dimensionsthree-dimensional space
  2. (of a film, transparency, etc) simulating the effect of depth by presenting slightly different views of a scene to each eye
  3. having volume
  4. lifelike or real
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012