Close-up vs Macro

Frequently a simple Close-up photo is called a Macro by those who comment. While, of course, it is not the end of the world, not even the end of photography as we know it, I still would like to know the technical definition of “Macro” or “Micro” photography. (Nikon used to call them Macro-Lenses now they call them Micro.)
I believe that you cannot simply move in on a cow and call it Macro…
So would somebody please enlighten me?…Bert

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