Full Idea
When p 'grounds' q then q holds in virtue of p's holding; q's holding is nothing beyond p's holding; the truth of p explains the truth of q in a particularly tight sense (explanation of q by p in this sense requires that p necessitates q).
Gist of Idea
Something is grounded when it holds, and is explained, and necessitated by something else
Source
report of Kit Fine (The Question of Realism [2001], 15-16) by Theodore Sider - Writing the Book of the World 08.1
Book Reference
Sider,Theodore: 'Writing the Book of the World' [OUP 2011], p.142
A Reaction
This proposal has become a hot topic in current metaphysics, as attempts are made to employ 'grounding' in various logical, epistemological and ontological contexts. I'm a fan - it is at the heart of metaphysics as structure of reality.
Related Idea
Idea 15007 If you make 'grounding' fundamental, you have to mention some non-fundamental notions [Sider on Fine,K]