1. 
2. 
[syn: proportion, proportionality, balance]
The Collaborative International Dictionary of English v.0.48:
Proportionality \Pro*por`tion*al"i*ty\, n. [Cf. F.
   proportionnalit['e].]
   The state of being in proportion. --Coleridge.
   [1913 Webster]
WordNet (r) 3.0 (2006):
proportionality
    n 1: a ratio of two quantities that is constant
    2: 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]