fourth dimension

noun

1

: a dimension in addition to length, breadth, and depth

specifically : a coordinate in addition to three rectangular coordinates especially when interpreted as the time coordinate in a space-time continuum

2

: something outside the range of ordinary experience

fourth-dimensional adjective

Example Sentences

Recent Examples on the Web

Albert Einstein believed space and time made up a fourth dimension. —Tim Newcomb, Popular Mechanics, 30 Jan. 2023

An example from a string theorist gives a view of what a fourth dimension could be. —Tim Newcomb, Popular Mechanics, 30 Jan. 2023

There’s no need to assume that the fourth dimension must already exist out into infinity. —Zeeya Merali, Discover Magazine, 29 Apr. 2015

The Time Machine, actor Rod Taylor plays a Victorian-era inventor who journeys into the fourth dimension on a sled attached to a large clock. —Bill Andrews, Discover Magazine, 31 May 2018

Thus, Ellis’ model of time retains enough of the block universe to match with relativity’s predictions, but without needing to take Einstein’s drastic last step of assuming that the fourth dimension is solidified into the infinite future. —Zeeya Merali, Discover Magazine, 29 Apr. 2015

That fourth dimension of human interaction and imprint is something Fendi rightly observes is in rich supply in Miami. —Luke Leitch, Vogue, 29 Nov. 2022

In the same way, a fourth dimension gives a knot a lot more leeway — too much, in fact. —Quanta Magazine, 18 May 2022

The innovation also adds a fourth dimension: emotional insight. —Tara Mcnamara, Variety, 3 Mar. 2022

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Word History

First Known Use

1875, in the meaning defined at sense 1