Fourth dimension or 4D can mean a number of things:Science Fourth dimension, the concept of a fourth spatial dimension Spacetime, the concept of time forming a fourth dimensionLiterature The Fourth Dimension, a non-fiction book by Rudy Rucker The Fourth Dimension, a book by Dr. Paul Yonggi Cho The Four-Dimensional Nightmare, a collection of science fiction short stories by J. G. BallardMusicThe Fourth Dimension, an album by H