Amen
Easton's Dictionary
This Hebrew word means firm, and hence also faithful (Rev. 3:14). In Isa. 65:16, the Authorized Version has “the God of truth,” which in Hebrew is “the God of Amen.” It is frequently used by our Saviour to give emphasis to his words, where it is translated “verily.” Sometimes, only, however, in John’s Gospel, it is repeated, “Verily, verily.” It is used as an epithet of the Lord Jesus Christ (Rev. 3:14).
It is found singly and sometimes doubly at the end of prayers (Ps. 41:13; 72:19; 89:52), to confirm the words and invoke the fulfilment of them. It is used in token of being bound by an oath (Num. 5:22; Deut. 27:15-26; Neh. 5:13; 8:6; 1 Chr. 16:36). In the primitive churches it was common for the general audience to say “Amen” at the close of the prayer (1 Cor. 14:16).
The promises of God are Amen; i.e., they are all true and sure (2 Cor. 1:20).
Smith's Dictionary
literally “true” and used as a substantive, “that which is true,” “truth,” (Isaiah 65:16) a word used in strong asseverations, fixing, as it were, the stamp of truth upon the assertion which it accompanied, and making it binding as an oath. Comp. (Numbers 5:22) In the synagogues and private houses it was customary for the people or members of the family who were present to say “amen” to the prayers which were offered. (Matthew 6:13; 1 Corinthians 14:16) And not only public prayers, but those offered in private, and doxologies, were appropriately concluded with “amen.” (Romans 9:5; 11:36; 15:33; 16:27; 2 Corinthians 13:14) etc.
International Standard Bible Encyclopedia
a-men' (in ritual speech and in singing a-men', a'men) ('amen; amen, = "truly," "verily"): Is derived from the reflexive form of a verb meaning "to be firm," or "to prop." It occurs twice as a noun in Isa 65:16, where we have (the King James Version, the Revised Version (British and American)) "God of truth." This rendering implies the pointing 'omen or 'emun i.e. "truth," or "faithfulness," a reading actually suggested by Cheyne and adopted by others. "Amen" is generally used as an adverb of assent or confirmation--fiat, "so let it be." In Jer 28:6 the prophet endorses with it the words of Hananiah. Amen is employed when an individual or the whole nation confirms a covenant or oath recited in their presence (Nu 5:22; De 27:15 ff; Ne 5:13, etc.). It also occurs at the close of a psalm or book of psalms, or of a prayer.
That "Amen" was appended to the doxology in the early church is evident both from Paul and Rev, and here again it took the form of a response by the hearers. The ritual of the installation of the Lamb (Re 5:6-14) concludes with the Amen of the four beasts, and the four and twenty elders. It is also spoken after "Yea: I come quickly" (Re 22:20). And that Revelation reflects the practice of the church on earth, and not merely of an ideal, ascended community in heaven, may be concluded from 1Co 14:16, whence we gather that the lay brethren were expected to say "Amen" to the address. (See Weizsacker's The Apostolic Age of the Christian Church, English translation, II, 289.)
James Millar