fourth dimension

noun

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

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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 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.