2. (noun)principle of superposition, superposition principle, superposition (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest Synonyms: principle of superposition, superposition, superpositionprinciple
3. (noun)superposition (geometry) the placement of one object ideally in the position of another one in order to show that the two coincide Synonyms: principle of superposition, superpositionprinciple