The Collaborative International Dictionary of English v.0.48:
Commensurateness \Com*men"su*rate*ness\, n. The state or quality of being commensurate. --Foster. [1913 Webster]WordNet (r) 3.0 (2006):
commensurateness n 1: the relation of corresponding in degree or size or amount [syn: commensurateness, correspondence, proportionateness]