American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Specified by or exhibiting four dimensions, such as the three spatial dimensions and single temporal dimension of relativity theory.
- adj. algebraic geometry Having four dimensions; being measurable along four mutually perpendicular axes.
- adj. physics Relating to the four dimensions of space-time (three spatial dimensions with the addition of time as the fourth)
- adj. involving or relating to the fourth dimension or time
“He likened the complex process to "four-dimensional chess.”
“It is contained in four-dimensional space, and is defined as the set of points at a fixed distance from a given point, just as the two-dimensional sphere (skin of an orange or surface of the earth) is defined as the set of points in three-dimensional space at a fixed distance from a given point (the center).”
“A very important thing to remember: The dark star calculations are done for a three-dimensional Euclidean space, while the black hole calculations are done for a four-dimensional Lorentzian spacetime (there is a big difference between the two).”
“If we have local coordinates defined, we can then represent the metric tensor in matrix form, where, for our four-dimensional spacetime, we will have a 4×4 matrix with elements gμν.”
“Finally you can do a sort of four-dimensional chart plotting one variable on the horizontal axis, a second of the vertical, and a third reflected in the size of a circle representing the data point, and a fourth indicated by the color of the circle.”
“He showed that the physics inside a hypothetical universe with five dimensions and shaped like a Pringle is the same as the physics taking place on the four-dimensional boundary.”
“Julian: Your desire for a dinghy is merely the tesseract shadow cast by the four-dimensional dinghy itself”
“Since the work of Einstein, we know that the stage on which the universe acts out its drama is not three-dimensional space but four-dimensional spacetime, and moreover that stage, spacetime itself, is dynamic and plays its own part in the evolving action.”
“In my next story I posited humans in a four-dimensional cage, put there by more powerful off-stage aliens.”
“In reality, there are three space dimensions, so the light would actually form an expanding or contracting sphere in 3D space rather than a circle in 2D, and the light cone would actually be a four-dimensional shape.”
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