'Superimposition' definitions:

Definition of 'Superimposition'

From: GCIDE

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. [1913 Webster]