fourth dimension


Definition of fourth dimension

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

Keep scrolling for more

Other Words from fourth dimension

fourth-dimensional adjective

Examples of fourth dimension in a Sentence

Recent Examples on the Web Not a physical entity, the fourth dimension could be felt as a type of transcendence, transmitted by the artist to a particular viewer through art. William C. Agee, WSJ, "New American Movement," 25 Dec. 2020 Einstein unified the three dimensions of space with the fourth dimension of time, and this spacetime will warp and stretch in the presence of a mass or equivalent distortion. Jennifer Ouellette, Ars Technica, "Challenge accepted: Inventing a plausible far-flung future for ST: Discovery S3," 20 Nov. 2020 Matthew Salesses considers the impact of his wife’s passing, and other factors, on his experience as a human passing through the fourth dimension. Sari Botton, Longreads, "Five Longreads Stories Selected for 2020 Editions of the ‘Best American’ Series," 13 May 2020 Though it was published a full decade before Einstein's theory of relativity, the book treats time as a fourth dimension, independent of the three dimensions of space, similar to how it is conceived in Einstein’s physics. Quanta Magazine, "Arrows of Time," 5 May 2020 And who could resist a detour into the fourth dimension at Time Travel Mart, which benefits Dave Eggers’ writing program for kids? Rachel Schnalzer,, "Four Hours: Laid-back Mar Vista is a calm haven amid the bustling Westside," 28 June 2019 Increasingly, though, there’s a fourth dimension: how much longer a destination or experience, as advertised, will be around for a tourist to enjoy. John Briley, Washington Post, "Endangered destinations," 18 July 2019 This notion that time is just a fourth dimension is highly misleading. Quanta Magazine, "A Defense of the Reality of Time," 16 May 2017 Now imagine turning all current static tests into dynamic tests with capabilities for stress testing by adding a fourth dimension to diagnostics—time. WSJ, "Is There a Limit to the Human Lifespan?," 24 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fourth dimension.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of fourth dimension

1875, in the meaning defined at sense 1

Keep scrolling for more

Learn More about fourth dimension

Time Traveler for fourth dimension

Time Traveler

The first known use of fourth dimension was in 1875

See more words from the same year

Statistics for fourth dimension

Cite this Entry

“Fourth dimension.” Dictionary, Merriam-Webster, Accessed 15 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Comments on fourth dimension

What made you want to look up fourth dimension? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!