proportional

adj

1. 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: ∝.

   “A vacuum-controlled straight air brake system is fitted, in which the driver's vacuum brake valve applies the train brake and makes a proportional application of the locomotive air brake.”

   “For example, according to the gas laws, pressure is directly proportional to temperature: the quotient derived from pressure (numerator) and temperature (denominator) will be constant; however, pressure is inversely proportional to volume, meaning that the product between volume and pressure will be constant.”

2. (US)In proportion (to), proportionate.

   “This ensures consistency across your website design so that you don't end up with elements that are not adequately proportional with each other.”

3. Of a typeface, having characters with natural (non-uniform) width (in contrast to monospace typefaces).

   “A font is proportional if all characters in the font have different widths due to their various sizes.”

noun

1. (archaic)A proportion.

   “It is almost superfluous to remark that the numbers attached to the elements of compounds are those of the proportionals in which they combine […]”