Faith, trust, belief, acceptance. From amana, to believe; and amina, to be tranquil in heart and mind, to become safe or secure, to trust; amana to render secure, grant safety. Iman is being true to the trust with respect to which Allah has confided in one by a firm believing of the heart, not by professing it on the tongue only. Derivatives: amn, peace, security, protection (the opposite of khawf); amin, trustworthy, faithful, honest (designation of the Prophet); mu'min, a believer, he who is given certainty and trust; Divine Name: al-Amin, He Who is secure from any causality.
To be safe or secure. Belief (in God, His word, His apostles, etc.), Faith.