fifth dimension

noun Mathematics, Physics.

a theoretical dimension beyond or in addition to a fourth dimension.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for fifth dimension

Historical Examples of fifth dimension

For two days of the Fifth-Dimension world Jacaro and his gunmen lay quiet.
The Fifth-Dimension Tube
William Fitzgerald Jenkins