proportional

Short definition from Wiktionary

Adjective

1. 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: ∝.
2. 2
   In proportion (to), proportionate.
3. 3
   Of a typeface, having characters with natural (non-uniform) width (in contrast to monospace typefaces).

Noun

1. 1
   A proportion.