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# fourth dimension

1. Physics, Math. a dimension in addition to length, width, and depth, used so as to be able to employ geometrical language in discussing phenomena that depend on four variables: Time is considered a fourth dimension for locating points in space-time.
2. something beyond the kind of normal human experience that can be explained scientifically: The story deals with ESP and other excursions into the fourth dimension.
[1870-75]

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Universalium. 2010.

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• fourth dimension — n. a dimension in addition to the ordinary three space coordinates of length, width, and depth: in the theory of relativity, time is regarded as the fourth dimension: see SPACE TIME (sense 1) fourth dimensional adj …   English World dictionary

• fourth dimension — fourth di mension n the fourth dimension an expression meaning time , used especially by scientists and writers of ↑science fiction …   Dictionary of contemporary English

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• fourth dimension — Since the theory of relativity it has been orthodox to treat time alongside the other three spatial dimensions, as the fourth dimension of a unified space time . In the late 19th century, physicists such as Helmholtz popularized work of Riemann… …   Philosophy dictionary

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• fourth dimension — N SING: the N In physics, the fourth dimension is time. The other three dimensions, which exist in space, are length, width, and height. [TECHNICAL] …   English dictionary

• fourth dimension — fourth′ dimen′sion n. 1) math. phs a dimension, usu. time, in addition to length, width, and depth, used to discuss phenomena that depend on four variables in geometrical language 2) cvb something beyond scientific explanation • Etymology:… …   From formal English to slang