'Proportionality' definitions:

Definition of 'proportionality'

From: WordNet
noun
A ratio of two quantities that is constant
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 [syn: proportion, proportionality, balance]

Definition of 'Proportionality'

From: GCIDE
  • Proportionality \Pro*por`tion*al"i*ty\, n. [Cf. F. proportionnalit['e].] The state of being in proportion. --Coleridge. [1913 Webster]