Superimpose, v. t. [imp. & p. p. Superimposed; p. pr. & vb. n. Superimposing.] — Webster enters it under “superimpose”
To lay or impose on something else; as, a stratum of earth superimposed on another stratum. -- Su`per*im`po*si"tion, n.
Shades of meaning
Fernald lists superimposed only as an antonym, under inherent.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given