అర్థం : (geology) the deposition of one geological stratum on another.

అర్థం : (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest.

అర్థం : (geometry) the placement of one object ideally in the position of another one in order to show that the two coincide.

అర్థం : The placement of one thing on top of another.