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The Categories was one of Aristotle`s most important treatises, receiving a greater number of late antique and medieval commentaries than most of his other works. Throughout its reception, scholars have disagreed as to whether the categories are purely description of language or whether they describe being. After discussing synonymity, it distinguishes simple terms from propositions and the difference between what can be predicated of a subject and what adheres in it. He then discusses the ten categories, or praedicaments (as they were called in the middle ages) in terms of predication. The categories are substance, quantity, quality, time, where, posture, relation, condition, action, and affection (what happens to something). The work concludes by discussing time and motion.