"With plural concord: things to be believed; matters of faith; propositions forming or belonging to a system. Also in singular (credendum): one such thing, an article of faith", Early 17th cent.; earliest use found in William Barlow. From classical Latin crēdenda things to be believed, neuter plural of crēdendus, gerundive of crēdere to believe.[credenda etymology, credenda origin, 英语词源]