Amen, meaning so be it, is of Hebrew origin.[5][6] The word was imported into the Greek of the early Church from the Jewish synagogue.[1][7] From Greek, amen entered the other Western languages. According to a standard dictionary etymology, amen passed from Greek into Late Latin, and thence into English.[8]
The Hebrew word amen derives from the Hebrew verb ’aman’, a primitive root.[9] Grammarians frequently list ’aman under its three consonants (’mn), which are identical to those of ’amen (note that the Hebrew letter א alph originally represented a glottal stop sound, which functioned as a consonant in the morphology of Hebrew).[8] This triliteral root (’mn) means to be firm, confirmed, reliable, faithful, have faith, believe.
Two English words that derive from this root are:
a. amen, from Hebrew ’amen (= "truly, certainly");
b. Mammon, from Aramaic mamona, probably from Mishnaic Hebrew mamôn, probably from earlier *ma’mon (=? “security, deposit”).
c. Both (a) and (b) derive from Hebrew ’aman (= "to be firm").
Popular among some theosophists and adherents of esoteric Christianity is:
- the conjecture that amen is a derivative of the name of the Egyptian god Amun (which is sometimes also spelled Amen).[10][11][12]
- some adherents of Eastern religions believe that amen shares roots with the Sanskrit word, "aum"/[13].
There is no academic support for either of these views[8]
Armenian word ամեն (pronounced /ˌɑːmˈɛn/) means "every", however it is used in the same form for ending of prayers[14]
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http://en.wikipedia.org/wiki/Amen#Etymology