Where does “subfunctionalisation” come from?

subfunctionalisation (English) comes from English functionalisation, from English functionalization, from English -ization, from English -ation, from Middle English -acioun, from Old French -ation, from Latin -ātiō, from Latin -tiō — small stone, pebble; gravel, rubble.

Ancestry of “subfunctionalisation”, step by step

subfunctionalisation traces back through two separate lines of ancestry.

via English functionalisation

StepLanguageWordMeaning
1EnglishfunctionalisationAlternative spelling of functionalization
2EnglishfunctionalizationThe act of functionalizing
3English-izationA suffix forming nouns denoting the act, process,...
4English-ationAn action or process; The result of an action or...
5Middle English-aciounForms nouns denoting an action, act, or doing,...
6Old French-ationation
7Latin-ātiō
8Latin-tiōtion, -ation, -ing
9Latindissertātiō(spoken) dissertation, discourse, disquisition
10Latindissertusarranged, disposed; explained
11Latindissereresecond-person singular future passive indicative...
12Latindis-asunder, apart, in two; reversal, removal;...
13Latincalceusshoe
14Latincalxlimestone; chalk; the finish line
15Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English sub

StepLanguageWordMeaning
1EnglishsubA submarine; A submarine sandwich: a sandwich...
2EnglishsubstituteTo use in place of something else, with the same...
3Middle Englishsubstituten
4Latinsubstitutussubstituted
5LatinsubstituoI place next to, under, or instead of; I...
6LatinstatuoI set up, station; I establish, determine, fix; I...
7Latinstātusfixed, set, having been set
8Latinstōto stand
9Proto-Italicstaēōstand
10Proto-Indo-Europeansth₂éh₁yetito stand
11Proto-Indo-European*steh₂-
Every word from Ancient Greek χάλιξ