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What is "principle of superposition"

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principle of superposition

  1. n. (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest [syn: superposition principle, superposition]

  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" [syn: Huygens' principle of superposition]