IPA: /ˌsuːpərɪmˈpəʊzɪʃən/
KK: /ˌsuːpərɪmˈpəʊzɪʃən/
The act of placing one image or object on top of another, often used in photography or graphic design.
The artist used superimposition to create a stunning visual effect in her collage.
Superimposition → It is formed from "super-" (meaning above or over) and "imponere" (meaning to place). The word refers to the act of placing one thing over another.
Think of something being 'placed over' ('super-') something else — that's what superimposition means.