break·e·ven or break-e·ven 
(brākēvən)
(brākēvən)adj.
Marked by or indicating a balance, especially between investment and return.
n.
1. The point, especially the level of sales of a good or service, at which the return on investment is exactly equal to the amount invested.
2. The point at which the energy produced by a system is equal to that put into it, thereby rendering the system self-sustaining. In both senses also called break-even point.