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

Examples of fourth dimension in a Sentence

Recent Examples on the Web

Physicists often talk about time as a fourth dimension, but what if there were a fourth spatial dimension — another direction entirely? — Quanta Magazine, 1 Oct. 2026

Although ostensibly a satire of Victorian society, the work also contains a mathematical treatise on the fourth dimension. — Manon Bischoff, Scientific American, 22 Sep. 2026

Apparently, the fourth dimension would be reached aboard a machine created by a fan-boat manufacturer with help from a slot-machine designer. — Spencer Elliott, Forbes.com, 27 July 2026

In some world models, the element of time is integral, constituting a fourth dimension. — Sharon Goldman, Fortune, 20 May 2026

Word History

First Known Use

1875, in the meaning defined at sense 1

Rhymes for fourth dimension

• apprehension
• comprehension
• condescension
• hypertension
• hypotension
• reinvention
• reprehension
• resuspension
• attention
• contention
• convention
• declension