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| radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays |
| an instrument that produces a graphic, visible representation of sound |
| fourth dimension | |
| —n | |
| 1. | the dimension of time, which is necessary in addition to three spatial dimensions to specify fully the position and behaviour of a point or particle |
| 2. | the concept in science fiction of a dimension in addition to three spatial dimensions, used to explain supernatural phenomena, events, etc |
| fourth-di'mensional | |
| —adj | |
| fourth dimension (fôrth) Pronunciation Key
Time regarded as a coordinate dimension. A fourth dimension is required by relativity theory, along with three spatial dimensions, to specify completely the location of any event. |