'anathematism' originates from Medieval Latin, specifically the word 'anathematismus,' where 'anathema' meant 'a curse' and the suffix '-ismus' denoted a practice or system.

'anathematismus' transformed into the French word 'anathématisme,' and eventually became the modern English word 'anathematism' through Middle English.

Initially, it meant 'the act of cursing or excommunicating,' and this meaning has largely remained the same in modern usage.