Definition
The degree of variation between the thick and thin strokes of a letterform. High-contrast faces, such as Bodoni, have dramatic variation between thick and thin. Low-contrast faces, such as Futura, have relatively uniform stroke width. Contrast is one of the defining attributes of typographic classification.
Source
— Robert Bringhurst — p. 323:
The degree of variation between the thick and thin strokes of a letterform.
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