Definition
The angle of inclination of the main strokes of italic or oblique letterforms, measured in degrees from the vertical. Most text italics have a slope of roughly 2° to 12°. Slope is distinct from axis: a letter can have an oblique axis with no slope, or a vertical axis with considerable slope.
Source
— Robert Bringhurst — p. 329:
The angle of inclination of the main strokes of italic or oblique letterforms.
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