• A quantity of something that is part of the whole amount or number.
  • Harmonious relation of parts to each other or to the whole.
  • Proper or equal share.
  • The relation of one part to another or to the whole with respect to magnitude, quantity, or degree.
  • A statement of equality between two ratios.
  • The "rule of three", in which three terms are given to find a fourth.
  • Size.


  • To divide into proper shares; to apportion.
  • To form symmetrically.
  • To set or render in proportion.
  • To correspond to.


  • From Middle English proporcion, from Old French proportion, from Latin prōportiō, from pro + portio; see portion.

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