superposition

Noun
  1. (geology) the deposition of one geological stratum on another (synset 113584585)
  2. (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest (synset 106000661)
  3. (geometry) the placement of one object ideally in the position of another one in order to show that the two coincide (synset 101055328)
  4. The placement of one thing on top of another (synset 101054991)

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