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proportionality (n.)

"character or state of being in proportion," 1560s, from French proportionalité (14c.) or directly from Medieval Latin proportionalitas, from proportio "comparative relation, analogy" (see proportion (n.)). The word was used in Middle English (proporcionalite) in mathematics in reference to geometrical ratios (mid-15c.).

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Definitions of proportionality from WordNet

proportionality (n.)
a ratio of two quantities that is constant;
proportionality (n.)
harmonious arrangement or relation of parts or elements within a whole (as in a design); "in all perfectly beautiful objects there is found the opposition of one part to another and a reciprocal balance"- John Ruskin;
Synonyms: proportion / balance
From wordnet.princeton.edu