Superposition : (noun) 1: (geology) the deposition of one geological stratum on
another
2: (geology) the principle that in a series of stratified
sedimentary rocks the lowest stratum is the oldest [syn: principle
of superposition, superposition principle]
3: (geometry) the placement of one object ideally in the
position of another one in order to show that the two
coincide
4: the placement of one thing on top of another
