Amen definition

From ecclesiastical Latin amen, from Greek ἀμήν, from Hebrew אמן ‘certainly, truly’ (cognate with Arabic ’amīn, Syriac: ('āmēyn))

At the end of Judeo-Christian prayers: so be it.
- 1662, Thine is the kingdom, the power, and the glory, for ever and ever. Amen. — Book of Common Prayer
- Also I shook my lap, and said, So God shake out every man from his house, and from his labour, that performeth not this promise, even thus be he shaken out, and emptied. And all the congregation said, Amen, and praised the Lord. And the people did according to this promise. — Nehemiah 5:13, KJV
- Blessed be the Lord God, the God of Israel, who only doeth wondrous things. And blessed be his glorious name for ever: and let the whole earth be filled with his glory; Amen, and Amen. — Psalm 72:18-19, KJV
At the end of a creed or in Biblical translations: truly, verily.

Amen, amen, I say to thee, except a man be born again, he can not see the kingdom of God. — John iii. 5http://www.blueletterbible.org/cgi-bin/c.pl?book=Jhn&chapter=3&verse=5&version=KJV#5 (Rhemish Translation)

1999 May, Matt Groening, “Hell Is Other Robots”, Futurama, season 1, episode 9

Fry: Bender's stupid religion is driving me nuts!

Leela: Amen!

An instance of saying ‘amen’.
A title of Christ; the Faithful One (especially with reference to Revelation 3:14)
- 1611, And unto the angel of the church of the Laodiceans write; These things saith the Amen, the faithful and true witness, the beginning of the creation of God — Revelation 3:14, KJV