·adj Relating to, or securing, proportion.
II. Proportional ·noun Any number or quantity in a proportion; as, a mean proportional.
III. Proportional ·noun The combining weight or equivalent of an Element.
IV. Proportional ·adj Having a due proportion, or comparative relation; being in suitable proportion or degree; as, the parts of an edifice are proportional.
V. Proportional ·adj Constituting a proportion; having the same, or a constant, ratio; as, proportional quantities; momentum is proportional to quantity of matter.