Where does “Croatianism” come from?

Croatianism (English) comes from English ism, from English -ism, from Latin -ismus, from Ancient Greek -ισμός, from Ancient Greek -μός, from Proto-Indo-European -mós — Creates action/result nouns from verb stems.

Ancestry of “Croatianism”, step by step

Croatianism traces back through two separate lines of ancestry.

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

via English Croatian

StepLanguageWordMeaning
1EnglishCroatianof or pertaining to Croatia, the Croatian people...
2EnglishCroatA native or inhabitant of Croatia; a person of...
3Medieval LatinCroata
4Proto-SlavicxъrvatъCroat
Every word from Proto-Indo-European -mósEvery word from English -ismEvery word from English ism
Croatianism — Etymology, Origin & Word History | Etymology Explorer