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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.
A marginal value is. 1  a value that holds true given particular constraints, 2  the change in a value associated with a specific change in some independent variable, whether it be of that variable or of a dependent variable, or. [ 3 when underlying values are quantified] the ratio of the change of a dependent variable to that of the independent variable.