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Proportional (a.) Having a due proportion, or comparative relation; being in suitable proportion or degree; as, the parts of an edifice are proportional.
Proportional (a.) Relating to, or securing, proportion.
Proportional (a.) Constituting a proportion; having the same, or a constant, ratio; as, proportional quantities; momentum is proportional to quantity of matter.
Proportional (n.) Any number or quantity in a proportion; as, a mean proportional.
Proportional (n.) The combining weight or equivalent of an element.