Full Idea
'Relational' grounding is between entities, best expressed by the two-place predicate 'x grounds y'. 'Operational' grounding is between sentences, best expressed by the two-place sentence operator read as 'because of' or 'in virtue of'.
Gist of Idea
Grounding can be between objects ('relational'), or between sentences ('operational')
Source
Barbara Vetter (Potentiality [2015], 1.6)
Book Reference
Vetter,Barbara: 'Potentiality: from Dispositions to Modality' [OUP 2015], p.27