Superimpose \Su`per*im*pose"\, v. t. [imp. & p. p. Superimposed; p. pr. & vb. n. Superimposing.]

To lay or impose on something else; as, a stratum of earth superimposed on another stratum. -- Su`per*im`po*si"tion, n.

Source: Webster's Revised Unabridged Dictionary (1913)