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The potential for a thermodynamic process to be reversed in time. Alternatively, a quantification of how far an irreversible process is from being reversible, which relies on a comparison to a corresponding theoretical reversible process.

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Hawking radiation and reversibility

For quantum-mechanical reversibility doesn't merely say that information must eventually be retrievable, after 1070 years or whatever; but also that, if U is an admissible transformation of a physical … More generally, even if Hawking radiation does carry away the infalling information, that still seems extremely far from implying full quantum-mechanical reversibility. …
Scott Aaronson's user avatar