This book provides detailed and multidisciplinary coverage of a wealth of key Qur’anic terms, with incisive entries on crucial expressions ranging from the divine names allāh (“God”) and al-raḥmān (“the Merciful”) to the Qur’anic understanding of belief and self-surrender to God. It examines what the terms mean in Qur’anic usage, discusses how to translate them into English, and delineates the role they play in expressing the Qur’an’s distinctive understanding of God, humans, and the cosmos. It offers a comprehensive but nonreductionist investigation of the relationship of Qur’anic terms to earlier traditions such as Jewish and Christian literature, pre-Islamic Arabic poetry, and Arabian epigraphy. While the dictionary is primarily engaged in ascertaining what the Qur’an would have meant to its original recipients in late antique Arabia, it makes selective and critical use of later Muslim scholarship alongside an extensive body of secondary research in English, German, and French from the nineteenth century to today.