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| a progressive disturbance propagated in a medium without progress or advance by the points themselves, as in the transmission of sound or light |
| the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature |
| principle of superposition | |
noun | |
| 1. | (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest |
| 2. | the displacement of any point due to the superposition of wave systems is equal to the sum of the displacements of the individual waves at that point; "the principle of superposition is the basis of the wave theory of light" |