Having a due proportion, or comparative relation; being in suitable proportion or degree; as, the parts of an edifice are proportional. Milton.
Relating to, or securing, proportion. Hutton. 3. (Math.) Constituting a proportion; having the same, or a constant, ratio; as, proportional quantities; momentum is proportional to quantity of matter. Proportional logarithms, logistic logarithms. See under Logistic. -- Proportional scale, a scale on which are marked parts proportional to the logarithms of the natural numbers; a logarithmic scale. -- Proportional scales, compasses, dividers, etc. (Draughting), instruments used in making copies of drawings, or drawings of objects, on an enlarged or reduced scale.
Any number or quantity in a proportion; as, a mean proportional.
The combining weight or equivalent of an element. [Obs.]
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