One of the mysteries of the English language finally explained.
Full assurance or certainty, especially in relation to an article of religious faith or doctrine.
Late 16th century; earliest use found in Henoch Clapham (fl. 1585–1614), writer on theology and preacher. From post-classical Latin plerophoria assurance, certainty and its etymon Hellenistic Greek πληροϕορία fullness of assurance, certainty (New Testament: Hebrews 6:11, 10:22, etc.) from πληροϕορεῖν to bring full measure, to satisfy fully (from πληρο-, combining form of ancient Greek πλήρης full, satisfied + ancient Greek ϕορείν to bear constantly: see -phoresis) + -ία.
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