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Could it be mei libri (My book)? As if to say, this is the page number in my copy but it may vary depending on the edition?
Chris, My friend wants to know the context. Is this from Burgess's book on justification?
Chris, I got an answer back from my friend. She didn't know herself, but she put it to her forum of Latin teachers, and one of them responded. It means "in the margin of the book." So it refers to a marginal note of some sort. "M" stands for "marginalia."