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
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Importantly for the team's new measurements, something that arises from warped space-time (in the fourth dimension, remember) is that physical matter isn't the only thing affected by the warps. Monisha Ravisetti, Space.com, 7 Aug. 2025 In other words, space-time is a conceptual model that combines the dimensions of space with a fourth dimension of time. Madison Dapcevich, Discover Magazine, 1 Aug. 2025 While some pregnant women are strapping on a belly band and calling it a day, the billionaire voice of Smurfette is innovating into the fourth dimension, wearing a skirt that, no joke, might be…inflatable? Elizabeth Logan, Glamour, 14 July 2025 Central to the installation is the artist’s playful reference to the Tesseract Cube: a calculation used in physics to go beyond matter into the fourth dimension. Joanne Shurvell, Forbes.com, 5 June 2025 See All Example Sentences for fourth dimension

Word History

First Known Use

1875, in the meaning defined at sense 1

Time Traveler
The first known use of fourth dimension was in 1875

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Cite this Entry

“Fourth dimension.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fourth%20dimension. Accessed 20 Aug. 2025.

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