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[?].
... can refer to:
Christiania - the name of Oslo, from 1624 to 1925.
The Free State of Christiania - a partially self-governing neighborhood in the city of ...