principle of superposition

Noun	1.	principle of superposition - (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest Synonyms: superposition principle, superposition
	2.	principle of superposition - 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" Synonyms: Huygens' principle of superposition

geology, principle, rule, superposition, superposition principle