Where does “secessionalism” come from?

secessionalism (English) comes from English secessional, from English secession, from Latin sēcessiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere, from Latin dis- — small stone, pebble; gravel, rubble.

Ancestry of “secessionalism”, step by step

secessionalism traces back through two separate lines of ancestry.

via English secessional

StepLanguageWordMeaning
1EnglishsecessionalRelating to secession
2EnglishsecessionThe act of seceding
3LatinsēcessiōA going aside, withdrawal, retirement
4Latin-tiōtion, -ation, -ing
5Latindissertātiō(spoken) dissertation, discourse, disquisition
6Latindissertusarranged, disposed; explained
7Latindissereresecond-person singular future passive indicative...
8Latindis-asunder, apart, in two; reversal, removal;...
9Latincalceusshoe
10Latincalxlimestone; chalk; the finish line
11Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via English ism

StepLanguageWordMeaning
1EnglishismAn ideology, system of thought, or practice that...
2English-ismUsed to form nouns of action or process or result...
3Latin-ismus-ism
4Ancient Greek-ισμόςForms abstract nouns
5Ancient Greek-μόςForms abstract nouns
6Proto-Indo-European-mósCreates action/result nouns from verb stems
Every word from Ancient Greek χάλιξEvery word from Latin -tiōEvery word from Latin dis-