SINCE 1828

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fourth dimension

noun

Updated on: 19 Apr 2018

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

—

fourth-dimensional

adjective

Recent Examples of fourth dimension from the Web

The game is a physics engine operating in 4D space, allowing you to play with objects and explore the fourth dimension.

— avery thompson, Popular Mechanics, "What It's Like to Play With 4D Hyperblocks," 22 June 2017
Chernow creates an interesting effect, working in a kind of fourth dimension: The reader’s mind keeps jumping from Grant’s 19th century to Trump’s 21st, making uneasy connections.

— lance morrow, National Review, "Ulysses Grant’s America and Ours," 2 Nov. 2017

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.

First Known Use of fourth dimension

1875

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