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Margin

In machine learning, a margin often refers to the distance between the two hyperplanes that separate linearly-separable classes of data points.

In this image from Wikipedia, the dotted lines represent the two hyperplanes dividing the white and black data points. The region between the lines is the margin.
In this image from Wikipedia, the dotted lines represent the two hyperplanes dividing the white and black data points. The region between the lines is the margin.

The term is most commonly used when discussing support vector machines, but often appears in other literature discussing boundaries between points in a vector space.