Usul al-din
Encyclopedia
Usul al-dín is an Arabic
Arabic language
Arabic is a name applied to the descendants of the Classical Arabic language of the 6th century AD, used most prominently in the Quran, the Islamic Holy Book...

 Islamic term which literally translates as 'foundation of the faith', roughly interpretable as 'theology
Theology
Theology is the systematic and rational study of religion and its influences and of the nature of religious truths, or the learned profession acquired by completing specialized training in religious studies, usually at a university or school of divinity or seminary.-Definition:Augustine of Hippo...

'. For Shi'a Twelvers the term has a specific meaning (see Theology of Twelvers).
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