superposition

1. The act of superposing or the state of being superposed: "Yet another technique in the forensic specialist's repertoire is photo superposition" (Patrick Nuyghe).
2. Geology. The principle that in a group of stratified sedimentary rocks the lowest were the earliest to be deposited.

The noun has 3 meanings:

Meaning #1: (geology) the deposition of one geological stratum on another

Meaning #2: (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest
  Synonym: principle of superposition

Meaning #3: the placement of one thing on top of another

Look up superposition in Wiktionary, the free dictionary.

Superposition can refer to:

• The superposition principle in physics, mathematics, and engineering, describes the overlapping of waves. Particular applications include:
  • Quantum superposition, in quantum physics
  • Superposition theorem, in electronics
• The superposition calculus, used in logic for equational first-order reasoning
• The law of superposition in geology and archaeology, which states that underground layers closer to the surface were deposited more recently

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