| | Rodney, you don't need to respond to me. I can tell from your other posts that you understand the importance of context. Sorry to pick on you, but your sentence was the most concise example I found.
Regi, why not ask a hard one? I suspect you have your own answers for these, but I'll give you a quick answer. But I don't really want to get dragged into this debate. I'm was just hoping that everyone would discuss how context matters to their position. Anyway, here's something.
You ask how context and differentiation affect these aspects of a concept: their formation; their meaning; their definition. First, I think the three are very much tied together. The formation of a concept works the way it does because of the nature of a concept. And the definition is an attempt at identifying the concept. So they're not three disjoint aspects.
So anyway, when you form the concept, you go through a process of differentiation. You observe the referents in a wider context of what you know, and recognize that they are similar to each other, and different from other things.
Skipping to definitions, the point of the definition is to identify the concept. The definition should be able to explain the kind of referents that belong to the concept, but also be able to say what's not in the concept. Which mean, you need to continue to be able to differentiate what's in the concept and what's not in the concept. That's why the context of your knowledge matters. What might have been a suitable criteria for distinguishing your concept in the past (i.e. rational animal), may no longer be adequate (i.e., Martians show up). If you don't change the definition, it will no longer properly explain the boundaries of your concept. What may have been deemed the essential distinguishing quality at one point may become insufficient.
As an aside on this, new information doesn't necessarily change the definition. We have concepts for specific reasons. If we find new things that aren't sufficiently different given our purpose for the concept, they might just be included. If we find a new type of deer-like animal, but with striped fur or something, we might continue to call them deer.
And now going back to your second question, which is how does differentiation and context relate to the meaning of a concept. I'm not quite sure what you mean here. Are you referring to the referents of a concepts? If so, I don't see how a wider knowledge would change the referents. If you know more, you might have more information about the referents, or you might know of new kinds of referents that still fit the concept (like a striped dear). But that's very different from how context affects the formation and definition.
That's if by "meaning of the concept" you meant the referents. But it might also be the way in which you retain the concept. The features of the referents that you find to be fundamental. These are the things you focus on. Like when someone says "Human beings", you probably focus on their rational faculty, or the kind of life they have (use of production and trade) or some other important quality. But if, after you meet all the Martians and friends, you may decide that being from earth is one of the fundamental qualities. Or maybe that we're warm blooded, or bipeds, or any number of other things.
If you take the file-folder analogy with concepts, the criteria for selecting what things go into that file is part of how you use it. When thinking about the referents of a concept, you alway keep in mind what things really are referents, and which things are outside of the concept, as well as where the borderlines are. With this in mind, context and differentiation matter for the same reason they matter for definitions and concept formation.
Since I have no idea what you're looking for, I don't know if that answered your question.
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