Uh, okay. I guess that's all I can expect.
Point is I don't know if there can be a common conception of an educated man without a common definition. I'm not an archaeologist or anthropologist or whatever, but not knowing any compelling reason to believe otherwise, I'd say it's probably the same with the notion of civilisation.
Now you can go back to discussing cradles of civilisation using the laziest analogies and terms.
To me it seems a problem of how human language works, and the kind of qualitative assessments we keep making all the time.
What you seem to be calling for is a working analytical definition. Well, such can be made, but especially in matters of history they usually turn out unsatisfactory. We make a definition, fine, along the lines of "by educated man/civilization I mean NN, because of NN".
Next thing happens someone pulls out an interesting society/person/phenomenon which clearly doesn't have all the features required by the analytical definition, yet still requires understanding and explanation. All the analytical definition then provides is fairly boring ruling of: "No, it does not comply with the criteria and so is not a civilization/educated man". Which is next to useless if you want to actually understand this society/person.
I've seen one of the most sterile academic debates ever unfold over an abstruse argument made by one very influential older historian arguing that according to his definition of "Enlightenment" Sweden never had one. (He reserved it exclusively for France and Scotland. Somehow his mates in France were flattered by the argument and even translated his train-wreck argument.)
But then there was a new generation of young Turk historians going:
"Fine! By your definition Sweden never had an Enlightenment, and we don't give a toss! We still want to understand what all these publishers, writers, parish priests, men of science and what not in the 18th c. were actually doing, and how they figured their place in the grand scheme of things, and who DID in fact refer themselves to part of an "Enlightenment" in Sweden."
Analytical definitions in history might on occasion tidy up discussions some, but then they tend to have to be highly provisional, or they have the power to send everyone cereening down some damn sterile and uninteresting tracks. Especially when academic prestige enters into it.
One of my personal peeves with them is when an historian postulates and analytical definition (eg. from personal experience: "By 'racism' I mean") and then doesn't even bother to actually USE the damn thing, simply assuming individuals and situations conformed to the definition they initially postulated, as if the definition itself could remove the onus of doing actual research and intepretation. I've now seen it often enough to actively warn students about analytical definitions in history. They are NOT the beef of writing history. Occasionally they can be a crutch, but if you can't actually toss it away in the end, you're doing it wrong, and it's holding you back.
Pet peeve of mine, this...
