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[?].
... channels BBC1 and BBC2, using terrestrial signals, and this is seen by some as influential (to a certain limited extent) in promoting the take-up of digita ...