Where does “Celtism” come from?

Celtism (English) comes from English Celt, from Latin celtis, from Latin certe, from Latin -ē, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.

Celtism (English): The customs and practices of the Celts

Definitions

  1. The customs and practices of the Celts

Ancestry of “Celtism”, step by step

Celtism traces back through two separate lines of ancestry.

via English Celt

StepLanguageWordMeaning
1EnglishCeltA member of one of the ancient peoples of Western Europe called Celtae by the Romans
2Latinceltisa tree, considered to be the hackberry; chisel
3Latincertecertainly, surely; at any rate
4Latinly; used to form adverbs from adjectives
5Latindis-asunder, apart, in two; reversal, removal;...
6Latincalceusshoe
7Latincalxlimestone; chalk; the finish line
8Ancient 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 dis-Every word from Latin