simple past tense and past participle of superpose

superimposed / (botany) That grows vertically above another part

(transitive) To place one object on top of another. / (transitive, mathematics) To place (one geometric figure) on top of another in such a way that all common parts coincide.

(of two objects) Able to be superposed in such a way as to coincide exactly

present participle of superpose

Third-person singular simple present indicative form of superpose

(geometry) congruence / (chemistry) The ability to bring two particular stereochemical formulae into coincidence by no more than translation and rotation