superposition

Noun

• the placement of one thing on top of another

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

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

• (geology) the deposition of one geological stratum on another

Related words

• Synonyms: 
  principle of superposition , superposition principle