What is the meaning of 'res vera?

Answer 1

"Here we see reference to the principle of relativity treated as synonymous with the subjectivist principle, as qualified by the principle of process. Note too the reference to ‘res vera,’ or ‘true thing.’ This is an assignment of ontological validity. As such we have here in this passage a reference also to the ontological principle. Thus, Whitehead’s statement, “that the being of a [true thing] is constituted by its ‘becoming,’” apart from being a restatement of the principle of process is also accurately reflecting his ontological convictions. What a thing is, is constituted by the process in which it becomes. The mechanism by which a thing becomes is referred to by Whitehead as ‘prehensions’, which are by definition feelings of other entities by the entity in becoming. They are purely subjective, in the sense that they uniquely belong to that subject.

_Truth and Reality in Whitehead's Metaphysics_, Glen Veitch

Answer 2

"true thing"