Main Page | See live article | Alphabetical index In philosophy, substance means, approximately, that element of an object without which it would not exist. In the millennia-old Aristotelian tradition, as well as early modern traditions that follow it, substances are treated as having attributess and modes. See objecthood and substance theory. See also: chemical substance simple:Substance This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.