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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.
Marginal utility means an additional or incremental utility. Marginal utility is the change in the total utility that results from unit one unit change in consumption of the commodity within a given period of time. For example, when a person increases the consumption of eggs from one egg to two eggs, the total utility increases from 30 utils to 45 utils.