The required return for a capital budgeting project.
The required return necessary to make a capital budgeting project worthwhile. Cost of capital would include the cost of debt and the cost of equity.
The opportunity cost of an investment, i.e. the rate of return that a company would otherwise be able to earn at the same risk level as the investment that has been selected.
The rate that a company must pay for its capital or the minimum return that is required to maintain the market value of a company's common stock. Cost of capital reflects the market's perception of the risk associated with a company's common stock.