[ three-dee ]
/ ˈθriˈdi /
of, relating to, or representing something in three dimensions; three-dimensional: 3D movies.
a three-dimensional form or appearance: My dreams are always in 3D.
Origin of 3D
An Americanism dating back to 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019