“Reasonableness” is linked to convincing power / rhetoric, which is inherent in communication and its effectiveness.
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Concepts do not exist without people communicating them and the boundaries of concepts are assigned by the communicators and are accepted or rejected on a social / community basis.
Dictionaries reflect usage and are descriptive although they CAN be used prescriptively but only as a negotiation point: “do we agree this is the common meaning?” and not as some kind of absolute platonic objectivity
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