commutability

from WordNet (r) 3.0 (2006)

commutability
    n 1: exchangeability by virtue of being replaceable [syn:
         {replaceability}, {substitutability}, {commutability}]
    2: the quality of being commutable [syn: {commutability},
       {transmutability}]

from The Collaborative International Dictionary of English v.0.48

Commutability \Com*mu`ta*bil"i*ty\, n.
   The quality of being commutable.
   [1913 Webster]