What does amen mean?
The definition of amen
A`men”, interj., adv., & n.
Etym: [L. amen, Gr. am certainly, truly.]

An expression used at the end of prayers, and meaning, So be it. At the end of a creed, it is a solemn asseveration of belief. When it introduces a declaration, it is equivalent to truly, verily. It is used as a noun, to demote: (a) concurrence in belief, or in a statement; assent; (b) the final word or act; (c) Christ as being one who is true and faithful. And let all the people say, Amen. Ps. cvi. 48. Amen, amen, I say to thee, except a man be born again, he can not see the kingdom of God. John ii. 3. Rhemish Trans. To say amen to, to approve warmly; to concur in heartily or emphatically; to ratify; as, I say Amen to all.

A`men”, v. t.
To say Amen to; to sanction fully.