[1] : The Collaborative International Dictionary of English v.0.48

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.
        wordnet 1.5

[2] : WordNet (r) 2.0

marginal cost
     n : the increase or decrease in costs as a result of one more or
         one less unit of output syn: incremental cost, differential
         cost
see also:
incremental cost differential cost 

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