Where does “Twelverism” come from?

Twelverism (English) comes from English Twelver, from English twelve, from Middle English twelve, from Old English twelf, from Proto-Germanic twalif, from Proto-Germanic -lif, from Proto-Indo-European leyp-, from Proto-Indo-European lēy- — to leave, let; to want, desire; to let; leave...

Twelverism (English): The largest branch of Shi'a Islam, believing that the Twelve Imams were divinely ordained leaders, and that the Mahdi will be the returned Twelfth Imam who disappeared and is believed by Twelvers to be in occultation

Definitions

  1. The largest branch of Shi'a Islam, believing that the Twelve Imams were divinely ordained leaders, and that the Mahdi will be the returned Twelfth Imam who disappeared and is believed by Twelvers to be in occultation

Ancestry of “Twelverism”, step by step

Twelverism traces back through two separate lines of ancestry.

via English Twelver

StepLanguageWordMeaning
1EnglishTwelverA member of the largest branch of Shi'a Islam,...
2EnglishtwelveThe cardinal number occurring after eleven and...
3Middle Englishtwelvetwelve
4Old Englishtwelftwelve
5Proto-Germanictwaliftwelve
6Proto-Germanic-lifleft over
7Proto-Indo-Europeanleyp-to stick; fat or sticky substance
8Proto-Indo-Europeanlēy-to leave, let; to want, desire; to let; leave...

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 lēy-Every word from Proto-Indo-European leyp-Every word from Proto-Germanic -lif