a·men 
(ā-mĕn, ä-mĕn)
(ā-mĕn, ä-mĕn)interj.
Used at the end of a prayer or a statement to express assent or approval.
[Middle English, from Old English, from Late Latin āmēn, from Greek, from Hebrew 'āmēn, certainly, verily, from 'āman, to be firm; see ʾmn in the Appendix of Semitic roots.]