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(mathematics) 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: ∝.
2012, David Ben-Chaim, Ratio and Proportion, page 34:
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.
1 When an adjective is applied predicatively to something definite, the corresponding "indefinite" form is used. 2 The "indefinite" superlatives may not be used attributively.