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Proportional

adj, noun

Adjective

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

Adjective

1
properly related in size or degree or other measurable characteristics; usually followed by ‘to’ wordnet
2
having a constant ratio wordnet

Noun

1
A proportion. archaic
"It is almost superfluous to remark that the numbers attached to the elements of compounds are those of the proportionals in which they combine […]"
2
one of the quantities in a mathematical proportion wordnet

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