superimposition
/ˌsupərɪmpəˈzɪʃən/
noun
- The act or result of placing one thing over another, especially so that both are visible.
- In geology, the superimposition of younger rock layers over older ones helps scientists understand Earth's history.
- The superimposition of the two photographs created a ghostly double exposure.
- The app allows the superimposition of virtual objects onto real-world scenes using augmented reality.
Synonyms