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

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

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

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