The following argument is based upon these assumptions, which I aver are all rationally defensible:

1. All that exists must be able to exist, which then supplants Existence with Ability as the metaphysical primary.

2. Gravity cannot possess any distinct existence. That is, there can be no such thing as gravity distinct or separate from the objects upon which it acts. Apart from these objects it has no relevance, which means it has no meaning, which means it cannot be defined as gravity.

3. There is no such thing as space qua space, because the distinction between objects cannot itself be a thing from which objects are also distinct. Therefore, there must be a different manifestation of distinction. I submit that gravity is this distinction.

In light of these, I submit the following about gravity:

Existence is ability to exist. Existence then is action, because ability must find rational expression as action. Action is always observed as relative movement. I therefore propose that gravity is, specifically, the expression of the ability to exist. Or perhaps better said, it is the action of existing…of existence observed  necessarily as an action.