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Wiktionary(0.00 / 0 votes)Rate this definition: 1  marginally(Adverb) in a marginal manner, or to a marginal extent; barely sufficiently; slightly. 2  marginally(Adverb) in the margin of a book.
Definition[edit] Marginal revenue is equal to the ratio of the change in revenue for some change in quantity sold to that change in quantity sold. This can also be represented as a derivative when the change in quantity sold becomes arbitrarily small.