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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
1870-1875
1870-75
Related forms
fourth-dimensional, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for fourth dimension
  • 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.
  • So they wrote: new experiments confirmed existence of the fourth dimension.
  • That's is the entire meaning of saying that time is the fourth dimension.
  • One suggestion is to consider the relevance of time horizon as a fourth dimension.
  • The fourth dimension, time, is used to log the period over which the given forecast takes place.
British Dictionary definitions for fourth dimension

fourth dimension

noun
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
Derived Forms
fourth-dimensional, adjective
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
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fourth dimension in Science
fourth dimension
  (fôrth)   
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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