Here’s a definition:
Art is magic delivered from the lie of being truth — Adorno, Minima Moralia
I’ll do my best to interpret this gnomic utterance. Magic, the ancient practice involving the supernatural, attends to the particularity of things in terms of spirits and demons, believing or pretending that there really are such entities, which can be invoked or defended against with incantations. This is untrue. There are no spirits and demons.
Art was the means by which magic was performed, with fetishes, amulets, symbolic carvings and decorations, and also ritual music and dance. But art did not decline along with the decline of magic rituals and beliefs; and now, in invoking and manipulating the spirits of things in its works—in bringing out the meaning of things in their interconnectedness and in their irreducible particularity, in treating things as spiritual rather than as specimens for scientific study—art continues to perform magic but liberated from the need to claim that there are supernatural entities or that it has the power to influence nature and events.
Adorno quotes his own definition in his lecture course,
An Introduction to Dialectics, to illustrate the difference between a “vulgar” definition and a good, philosophical one, his own being an example of the latter, of course. His point is that his definition is only meaningful to someone who is responsive to art and who is able to understand it. Thus he is
explicating a concept, allowing it to unfold in a meaning-full context. In a sense, then, whether an explicative definition comes at the start or concludes a work or discussion is irrelevant. Similarly, we can make arguments by beginning with a statement of the conclusion—indeed I think this is the clearest and most common way of presenting arguments in philosophy.
Over the course of a few lectures he argues against the dependence on definitions in philosophy, and one of his arguments is pretty much the same as
@Banno’s, about the circularity of definition and the primacy of use (in Adorno’s terms, the life of the concepts), although in Adorno’s case it’s wielded to show that Hegelian dialectics is the best philosophy for explicating the truth of concepts. The aim is something like allowing concepts to speak rather than imposing others on them.
Every concept is indeed internally dynamic, and the task is somehow to do justice to this dynamic character. And here it is often enough language itself that will have to furnish the canon for the appropriate use of concepts. — Adorno, An Introduction to Dialectics
That is to say, it’s in the use of a term that we can understand the meaning of concepts, not primarily by definitions. I guess this is about what we should expect definitions to do: should they help us think new thoughts or should they keep our thoughts on the rails?