Where does “antiquarism” come from?

antiquarism (English) comes from English antiquary, from Latin antiquarius, from Latin antīquus, from Latin ante, from Ancient Greek κλίσις, from Ancient Greek -σῐς, from Ancient Greek -τις, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

Ancestry of “antiquarism”, step by step

antiquarism traces back through two separate lines of ancestry.

via English antiquary

StepLanguageWordMeaning
1EnglishantiquaryA person who is knowledgeable of, or who collects...
2Latinantiquariusancient, antique; antiquarian, antiquary
3Latinantīquusold, ancient
4Latinantebefore, in front, forwards; before; before,...
5Ancient Greekκλίσιςbending, inclination; a lying down; a place for...
6Ancient Greek-σῐς"suffix forming nouns"
7Ancient Greek-τιςretained after dentals
8Proto-Indo-European-tisDerives abstract/action nouns from verb roots

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 Proto-Indo-European -tisEvery word from Ancient Greek -σῐςEvery word from Ancient Greek κλίσις