@Paracelsus,
Paracelsus wrote:. . . For arguments sake 'Being is the that is of the human condition while existence is the What is of that Being.'
And if we define something that does not imply that it has no room for extension does it?
What about things that aren't human, such as, to pick one, a tree. Being or existence?
How about a painting of a tree, or a poem about a tree (Joyce Kilmer, been there, seen the placque and the window and the tree). Being or existence?
How about Being itself. What is the being of Being.
If we define something we have to define it
with something and that something would have being, so being would have to come before definition.