fourth dimension

noun
1.
Physics, Mathematics. a dimension in addition to length, width, and depth, used so as to be able to employ geometrical language in discussing phenomena that depend on four variables: Time is considered a fourth dimension for locating points in space-time.
2.
something beyond the kind of normal human experience that can be explained scientifically: The story deals with ESP and other excursions into the fourth dimension.

Origin:
1870–75

fourth-dimensional, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
fourth dimension
 
n
1.  the dimension of time, which is necessary in addition to three spatial dimensions to specify fully the position and behaviour of a point or particle
2.  the concept in science fiction of a dimension in addition to three spatial dimensions, used to explain supernatural phenomena, events, etc
 
fourth-di'mensional
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
fourth dimension   (fôrth)  Pronunciation Key 
Time regarded as a coordinate dimension. A fourth dimension is required by relativity theory, along with three spatial dimensions, to specify completely the location of any event.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In physics, the fifth dimension is a hypothetical dimension which would exist
  at a right angle to the fourth dimension.
What's especially interesting is using the fourth dimension to create a third
  spatial dimension from a two-dimensional image.
We can think about the fourth dimension and do math int he fourth dimension.
His slightest movement in the direction of a fourth dimension would put him at
  once out of three-dimensional space.
Synonyms
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