A person who is trustworthy or reliable.

Origin: The word مأمون (ma'mun) is derived from the Arabic root أ م ن (a-m-n), which relates to safety, security, and trustworthiness.
Historical and Cultural Context: The concept of trust and reliability has been a cornerstone in Arab culture, heavily emphasized in social and business interactions. The word has been used historically to describe individuals who can be relied upon to act with integrity.
Evolution: Over centuries, مأمون has maintained its core meaning, becoming synonymous with individuals who are deemed responsible and reliable. It has been used in various contexts, including in the naming of historical figures, such as the Abbasid Caliph Al-Ma'mun, known for his wisdom and patronage of the arts.
Modern Relevance: Today, مأمون is often used in both formal and informal settings to describe people or entities that are considered trustworthy, reflecting the enduring value of integrity in modern society.

The name Al-Ma'mun, one of the most renowned Abbasid Caliphs, is derived from this word. He is famous for founding the House of Wisdom in Baghdad, a major intellectual center during the Islamic Golden Age.