I mean this question in two senses.
1) What are our primitive terms?
Say that a certain term is taken as primitive in a dialectical context if it is supposed in that context that sentences involving that term can't or needn't be given a definition that doesn't invoke the term in question (or a synonym thereof).
For metaphysicians debating the nature of material objects, 'part' is often taken as primitive in this sense. Sentences of the form 'x is a part of y' (or some variant) are considered to be at the bedrock of theorizing, and then other mereological terms are defined in terms of parthood. Sentences of the form 'x is a proper part of y', for example, are not primitive, since they can be defined as follows: 'x is a part of y and x is not identical to y'. ('Identical' is also taken as primitive in this context.) And so on.
Informally, the primitive terms of a debate are those terms with respect to which the question "What do you mean by *that*?" can only be answered by an incredulous stare. If you don't know what I mean by that, then we can't even have this conversation. Other candidate philosophical primitives: 'good', 'right', 'thing', and 'true'.
Peter van Inwagen, in this paper, seems to suggest that 'able' is one of our primitive terms.
Tim O'Connor, in this paper, is explicit about taking 'brings about' (or 'produces') as a primitive term to be used in understanding agent-causation.
2) What are our primitive principles?
Say that a certain principle is taken as primitive in a dialectical context if it is presumed in that context to be evidently true and either can't or needn't be argued for.
Perhaps the claim that knowledge is factive has the status of an epistemological primitive principle in most dialectical contexts. In metaphysics, maybe we can include as primitive the claim that things could have been different.
Informally, primitive principles in a certain context can be used as the engines behind reductio ad absurdum arguments: if your metaphysical picture entails necessitarianism, then it's back to the drawing board. Or, closer to home, if your view of moral responsibility entails that dogs can deserve the death penalty, then it's back to the drawing board.
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Perhaps what's behind these questions is a curiosity about how much those who theorize about free will and moral responsibility actually agree about. Do we have starting points? And how well can we articulate them?
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