Strong's G281 — ἀμήν (Hebrew)
amen (am-ayn') heb.
1. (properly) firm
2. (figuratively) trustworthy
3. (adverbially) surely
4. (often as interjection) so be it
[of Hebrew origin (H543)]
KJV: amen, verily 
Root(s): H543 
Hebrew root: אָמֵן
Occurrences: 129