(mathematics) At a constant ratio (to). Twomagnitudes (numbers) are said to be proportional if the second varies in a direct relationarithmetically to the first. Symbol:∝.
2012, David Ben-Chaim,Ratio and Proportion, page34:
For example, according to the gas laws, pressure is directlyproportional to temperature: the quotient derived from pressure (numerator) and temperature (denominator) will be constant; however, pressure is inverselyproportional 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.
