Amen: Old English, from Late Latin amen, from Ecclesiastical Greek amen, from Hebrew amen “truth,” used adverbially as an expression of agreement (as in Deuteronomy xxvii.26, | Kings 1.36), from Semitic root am-n “to be trustworthy, confirm, support.” Used in Old English only at the end of Gospels, as an expression of concurrence after prayers, it is recorded from early 13c.