Definition of amen:
(v) :
at the end of prayers: so be it; 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 ii. 3. Rhemish Translation"
(interjection) :
an expression of strong
agreement
(n) :
an instance of saying 'amen'; a title of Christ; the Faithful One (especially with reference to Revelation 3:14)