In medicine or philosophy, something that is neither clearly beneficial nor harmful; an indifferent matter.
From Greek 'a-' (not) + 'dia-' (through) + 'phone' (sound or utterance), originally referring to sounds that made no distinction, later applied to things morally indifferent.
In ancient Stoic philosophy, an 'adiaphon' was something truly neutral—neither virtue nor vice—which was a radical idea because the Stoics believed most of life's stuff doesn't really matter for being a good person.
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