Etymology
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amen (interj.)
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, I Kings i.36), from Semitic root a-m-n "to be trustworthy, confirm, support."

Compare similar use of Modern English certainly, absolutely. Used in Old English only at the end of Gospels, otherwise translated as Soðlic! or Swa hit ys, or Sy! As an expression of concurrence after prayers, it is recorded from early 13c.
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Ammon 
name of the Greek and Roman conception of the Egyptian sovereign sun-god Amun (said to mean literally "hidden"), also Amen-Ra. This they confused with the ram-headed divinity, god of life, worshipped at an oracular sanctuary in Libya. See ammonia. Related: Ammonian.
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Maranatha 

late 14c., "at the coming of the Lord," a Bible word, from Greek maranatha, a Greek form of an untranslated Aramaic (Semitic) word in I Corinthians xvi.22, where it follows Greek anathema (with which it has no grammatical connection), and therefore has been taken as part of a phrase which is used as a curse (see anathema). The Aramaic word has been explained as "Our Lord, come thou" or "Our Lord hath come," apparently a solemn formula of confirmation, like amen; but possibly it is a false transliteration of Hebrew mohoram atta "you are put under the ban," which would make sense in the context [Klein].

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