- 1small and not important synonym slight a marginal improvement in weather conditions The story will only be of marginal interest to our readers. The difference between the two estimates is marginal.
- 2 not part of a main or important group or situation marginal groups in society His grandfather spoke a marginal Native American language.
- 3[only before noun] written in the margin of a page marginal notes/comments
- 4(of land) that cannot produce enough good crops to make a profit
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