Definition of: proportional

(prə·pôr′shən·əl, -pōr′-) adjective
1. Of, pertaining to, or being in proportion.
2. Math. a Constituting the terms of a proportion: said of four quantities: The numbers 2, 3, and 8, 12 are proportional. b Varying so that corresponding values form a proportion.
—noun Any quantity or number in proportion to another or others.
—pro·por′tion·al·ly adverb
—pro·por′tion·al′i·ty (-al′ə·tē) noun