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The Collaborative International Dictionary
Superposable

Superposable \Su`per*pos"a*ble\, a. Capable of being superposed, as one figure upon another.

Wiktionary
superposable

a. (context of two objects English) Able to be superposed on each other in such a way as to coincide exactly

WordNet
superposable

adj. coinciding exactly when superimposed; "identical triangles" [syn: identical]