The meaning of Amen in the Bible
(From Easton's Bible Dictionary)

This Hebrew word means firm, and hence also faithful (Revelation 3:14). In Isaiah 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 (Revelation 3:14).

See more on the meaning of Amen in the Bible:
Amen {International Standard Bible Encyclopedia}

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