Strictly speaking, [it is] what subsists by itself and with its own constitution.[1] So there is a thing both subsistent and essential where the gathering of what is accidental subsists as in one underlying reality and actuality.[2]
The etymology of 'subsistence' [u(po/stasis] derives from the [verb] 'to subsist' [u(festa/nai] and 'to exist' [u(pa/rxein].
But in Aelian he calls opposition u(po/stasis ['resistence']. For he says: "the Syrian people revolted [sc. from Persia] and he received in addition the neighbors of the Phoenicians in regard to both the same attack and resistance."[3]