payback

(pāˈbăkˌ)

1. a. The return gained from or paid on an investment: “One problem with space ventures is that the up-front costs are enormous and the paybacks uncertain and far off at best” (Eric Gelman).
   b. The return on an investment equal to the amount invested: expect a payback within six years.
2. A benefit gained as the result of a previous action.
3. The act or process of paying back.