Where does “Pentecostalist” come from?

Pentecostalist (English) comes from English Pentecostal, from English Pentecost, from Middle English Pentecoste, from Old English pentecosten, from Ecclesiastical Latin pentecoste, from Koine Greek πεντηκοστή, from Ancient Greek πεντηκοστή, from Ancient Greek πεντηκοστός.

Pentecostalist (English): of or pertaining to Pentecostalism; A member of...

Definitions

  1. of or pertaining to Pentecostalism; A member of...

Ancestry of “Pentecostalist”, step by step

Pentecostalist traces back through two separate lines of ancestry.

via English Pentecostal

StepLanguageWordMeaning
1EnglishPentecostalOf, or relating to Pentecost; Of, or relating to...
2EnglishPentecost
3Middle EnglishPentecostePentecost Christian holiday
4Old EnglishpentecostenPentecost
5Ecclesiastical LatinpentecosteAlternative letter-case form of Pentēcostē
6Koine GreekπεντηκοστήPentecost - From the feast called Shavuot, which...
7Ancient GreekπεντηκοστήPentecost - From the feast called Shavuot, which...
8Ancient Greekπεντηκοστόςfiftieth
9Ancient Greekπεντήκονταfifty
10Proto-Indo-Europeanpenkʷēḱomth₂
11Proto-Indo-European*pénkʷedḱomt

via English ist

StepLanguageWordMeaning
1EnglishistA practitioner or supporter of an ism
2English-istAdded to words to form nouns denoting
3Old French-iste
4Latin-ista-ist; one who practises or believes
5Ancient Greek-ιστήςAlternative form of -τής; -ist
6Ancient Greek-τήςAppended to verbs to form agent nouns
7Proto-Hellenic-tās
Every word from Proto-Indo-European *pénkʷedḱomtEvery word from Proto-Indo-European penkʷēḱomth₂Every word from Ancient Greek πεντήκοντα