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'Is there a working definition .... ?"

Actually, probably not, except insofar as we are creating one as we go along (see comment below). But yes, there do seem to be at least some anatomical correlates. And there is a relevant story about "memory." There is a relatively clear operational and empirical distinction between "declarative" or "explicit" and "procedural" or "implicit"memory. The latter corresponds roughly to information in the unconscious, the former to story information. People with Alzheimer's, for example, may act in ways that reflect prior experiences but have no awareness of having had such experiences. For an interesting clinical exploration of this, see dementia and the unconscious.