To place or lay one thing over or above another, especially so that they coincide. The architect decided to superpose the new design over the old blueprint to compare the changes.
To combine or overlay (signals, waves, images, etc.) in accordance with the principle of superposition so that their individual effects add together. When two light waves are superposed, an interference pattern appears on the screen.
(intransitive, physics) Of waves or quantum states: to overlap in space or time so that their amplitudes or probabilities add together. The electromagnetic fields from the antennas superpose to create areas of constructive and destructive interference.