From systematic + -ity.
systematicity (countable and uncountable, plural systematicities)
- (now chiefly philosophy and linguistics) The state or quality of being systematic
1845, J. L---y, “The Myths of 'Harmony'”, in The Musical World, page 291:
- The coincidence in modern tongues between harmony, as spoken of sounds, with any other concordance or systematicity— is one derived from ancient Greek sources and roots […] .
2007 March 6, Andrew Sneddon, “The depths and shallows of psychological externalism”, in Philosophical Studies, volume 138, number 3, DOI:10.1007/s11098-006-9058-8:
- […] but it is reasonable to see a certain amount of causal and functional integration as a hallmark of systematicity.