Pronunciation: (ri-plās'),[key] —v.t.,-placed, -plac•ing. 1. to assume the former role, position, or function of; substitute for (a person or thing): Electricity has replaced gas in lighting. 2. to provide a substitute or equivalent in the place of: to replace a broken dish. 3. to restore; return; make good: to replace a sum of money borrowed. 4. to restore to a former or the proper place: to replace the vase on the table.