There are different ways to define Va, but that doesn't mean they're all correct.
See
Maneuvering Speed Limitation Statement for the FAA's guidance on the definition of Va, and how one pilot's misunderstanding of it contributed to a fatal accident.
Per the FAA:
VA is a structural design airspeed used in determining the strength requirements for the airplane and its control surfaces. The structural design requirements do not cover multiple control inputs in one axis or control inputs in more than one axis at a time at any speed, even below VA.
Can anyone point out a definition of Va from an accredited body that even mentions the word "stall"? I've never seen one.