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Reversible process in thermodynamics?

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My undergraduate chemistry course book states that the process: "Two blocks of iron of different temperature are brought into closer contact and thermal equilibrium is attained" is a "reversible" process. I don't exactly understand how this can be, since the process will not occur in the reverse direction spontaneously (i.e the previously warmer block will not get heated up again with respect to the other block, spontaneously). I cannot find any suitable websites that give a good explanation on this matter. I'm sure that I'm looking in the wrong direction. Just direct me in the right direction, I don't need the answer.

Thanks.

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