Pronunciation: (sOO"pur-pōz'), [key]
—v.t., -posed, -pos•ing.
1. to place above or upon something else, or one upon another.
2. Geom.to place (one figure) in the space occupied by another, so that the two figures coincide throughout their whole extent.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.