The Collaborative International Dictionary
marginal cost of production
marginal cost \marginal cost\, marginal cost of production \marginal cost of production\n. (Economics) The increase in total cost of production as a result of producing one more unit of output; since certain ovrhead costs are fixed, the marginal cost is almost aways less than the total per-unit cost of production averaged over all units produced.
Syn: incremental cost, differential cost.