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.
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.
May the Fourth be with you
Read more in this article about some frequently asked questions and fun facts related to our definitions.
Pluto gains a fourth moon, but what should it be named?
Pluto may have been demoted to a dwarf planet in 2006, but that hasn’t stopped astronomers from studying this intriguing plutoid. NASA recently announced the discovery of a fourth moon, be it a “mini-moon,” circling the former planet. Dubbed “P4” for the time being, the hunt is on for an appropriate name. The practice of naming planets after gods and goddesses can be traced back …
Origin of fourth dimension
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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
the concept in science fiction of a dimension in addition to three spatial dimensions, used to explain supernatural phenomena, events, etc
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
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.