When gravity is the only force acting on an object the object is in what?

One answer is that it is in free-fall in a vacuum (to eliminate atmospheric drag). Another answer is that it is in orbit around another body. The object could be in inter-stellar space, essentially experiencing the balanced gravitational force of "everything". If you eliminate the "middle of space" solution, the object would have to be in a state of acceleration.

A seagull drops a clam while flying over a beach.