אמן
'âman
aw-man'
A primitive root; properly to build up or support ; to foster as a parent or nurse; figuratively to render (or be ) firm or faithful, to trust or believe, to be permanent or quiet; morally to be true or certain; once (in Isaiah 30:21; by interchange for H541) to go to the right hand: - hence assurance, believe, bring up, establish, + fail, be faithful (of long continuance, stedfast, sure, surely, trusty, verified), nurse, (-ing father), (put), trust, turn to the right.
LXX related word(s)
G4103 pistos