If it is a fight between at least 2 players it’s pvp. PvP does not require both sides to be shooting.
The reason I specify the part with “does not require both sides to be shooting” is not just because ganking is a form of pvp where one side is usually very much afk and making itself a target, but also because there are pvp fights that make it impossible for one side to actually shoot. See ECM, sensor dampeners, neuts etc.
If I dampen you so you can’t even lock me, it’s still a pvp fight eventhough you don’t shoot me, for example.
So imo pvp as a general definition is simply at least 2 players interacting with each other, with at least one having the intend to kill the other (side).