'systematicness' originates from English, specifically from the adjective 'systematic' plus the noun-forming suffix '-ness', where 'systematic' ultimately traces back to Greek 'systema' (via Latin/Medieval Latin) meaning 'an organized whole' and the suffix '-ness' meant 'state or quality'.

'systematic' developed in English from Medieval Latin or French forms influenced by Greek 'systema' (from σύν 'syn-' meaning 'together' + a root meaning 'to set up/stand'), and the modern English noun 'systematicness' was formed by adding the Old English-derived suffix '-ness' to 'systematic'.

Initially related to being 'of or pertaining to a system' or 'organized whole', the sense evolved to emphasize the 'quality or state of being methodical or organized'—the modern use of 'systematicness' retains that specialized quality-meaning.