To type, typeset, or design text using a typeface that has the same width for each character.
Of a typeface, having characters with uniform width.
In proportion (to), proportionate.
Of a typeface, having characters with natural (non-uniform) width (in contrast to monospace typefaces).
At a constant ratio (to). Two magnitudes (numbers) are said to be proportional if the second varies in a direct relation arithmetically to the first. Symbol: ∝.