al-ʾUmūr al-ʿāmma refers to the introductory chapter heading for concepts and topics which address the issues of metaphysics, the science of the universal. This introductory heading which encompasses general topics, concepts, and cases, is the most distinctive feature that differentiates the kalām in the Muta’akhkhirūn period from the Kalām in the Mutaqaddīmūn period. This is because the science of Kalām inherited these topics as the result of its interaction with peripatetic philosophy represented by Islamic philosophers, such as al-Kindī, al-Fārābī, and (...) Avicenna. Before Fakhr al-Dīn al-Rāzī, theologians addressed various concepts such as mawjūd, maʿdūd, maʿdūm, qadīm, muḥdāth, shayʾ by including them in their works as commonly used nouns and adjectives in a disorganised manner or without devoting a separate chapter heading to them. It was al-Rāzī, who discussed al-ʾumūr al-ʿāmma under a separate heading with original content and through a combined method based on the relationship between Kalām and philosophy by using the previously available literature, that helped al-ʾumūr al-ʿāmma acquire an important status in the science of Kalām. This is because this tittle, which examine abstract and general concepts such as existence, non-existence, mawjūd, maʿdūm, quiddity (māhiyyah) and its appendages such as unity, multiplicity, necessity, possibility, impossibility, ḥudūth, eternity a parte ante (qidam), substance (jawhar), accident (ʿaraḍ), cause (ʿilla), and maʿlūl, were reconsidered by the theologians after al-Rāzī and became a point of departure for their works. Later theologians largely followed al-Rāzī’s framework and organisation of al-ʾumūr al-ʿāmma and/or based their new organisations on it. Besides using his framework, they tried to define al-ʾumūr al-ʿāmma in different ways and from different perspectives, and, at times, allowed for debates of sorts. One of the debates that emerged as a result of these defining endeavours is why these concepts were included within the scope of al-ʾumūr al-ʿāmma discussions or what aspects of these concepts were discussed within al-ʾumūr al-ʿāmma. This debate revolves around such notions as quiddity, impossibility, and non-existence in relation to the aforementioned notions. Among these concepts, non-existence takes the lead. This is because existence is both the most general concept and one of the most commonly addressed concepts in al-ʾumūr al-ʿāmma due to its direct relationship with other concepts. This has brought non-existence, which has a close relationship with existence, to the forefront. In these discussions, the concept of non-existence is sometimes examined alone, sometimes together with the concept of impossibility, both directly and indirectly. In fact, the reason for the inclusion and evaluation of the concept of non-existence in al-ʾumūr al-ʿāmma per se has turned into topic of discussion by itself over time. In this context, after discussing the conceptualisation process of al-ʾumūr al-ʿāmma, this study examines how philosophers and theologians, who, it must be reiterated, define al-ʾumūr al-ʿāmma in different ways, examine the concept of non-existence under that chapter heading, and it goes on to determine the aspects that led them to include non-existence therein. (shrink)