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Explanation: The Oxford-Duden lists "accidental" as the translation within both the philosophical and the medical fields.
In a philosophical sense (Aristotle), the accidental is what is not essential to an entity, i.e. you could take away an accidental characteristic and it would still be the same entity, e.g. a man who loses both his arms in an accident (no pun intended) is still a man. In this context, an alternative translation might be "acquired characteristics".