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SUPERPOSITION

Definition:

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