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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.
It means to think about your next step forward. The word marginal means additional.. The first glass of lemonade on a hot day quenches your thirst, but the next glass, maybe not so much. If you think at the margin, you are thinking about what the next or additional action means for you.