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 attributes[?] and modes[?].
... households, and 13,363 families residing in the city. The population density is 481.1/km² (1,246.0/mi²). There are 23,525 housing units at an average density ...