principle of superposition

(noun) (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest. Synonyms: principle of superposition, superposition principle, superposition.

(noun) 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. Synonyms: principle of superposition, Huygens' principle of superposition. Example: "The principle of superposition is the basis of the wave theory of light."