Meaning

noun someone who conforms to established standards of conduct (especially in religious matters)

adjective marked by convention and conformity to customs or rules or styles

adjective adhering to established customs or doctrines (especially in religion)

originEtymology tree English conform Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Hellenic *-tās Ancient Greek -τής (-tḗs) Ancient Greek -ῐστής (-ĭstḗs)bor. Latin -istader. Old French -istebor. Middle English -ist English -ist English conformist From conform + -ist.

Etymology from Wiktionary, CC BY-SA 3.0