No, slavery is not an entity.<quoted text>No? Objectively, slavery IS an "entity". An entity IS an object....its essence exists.
If it were, you could display slavery on a table independent of any other thing.
Slavery is a condition. It's a concept. It's an economic system. Etc.
However, NONE of that makes it a physically real object that exists outside of society.
You can not have slavery without people to conduct slavery.