PROPORTIONALITY

proportion, proportionality, balance

(noun) 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

proportionality

(noun) a ratio of two quantities that is constant

Source: WordNet® 3.1

Etymology

Noun

proportionality (countable and uncountable, plural proportionalities)

(uncountable) the property of being proportional

(uncountable) the principle that government action ought to be proportional to the ends achieved (e.g. the military should not be deployed to stop petty vandalism)

(countable) the degree to which something is in proportion

Source: Wiktionary

Pro*por`tion*al"i*ty, n. Etym: [Cf. F. proportionnalité.]

Definition: The state of being in proportion. Coleridge.

Source: Webster’s Unabridged Dictionary 1913 Edition