What is the terminology please for the study of singular concepts that have a degree of plurality so that I research the matter more. If such a thing exists. This is obviously bound to count nouns and their agreements. I am talking about the sliding scale that seems to exist with singular nouns, such as 'everybody' that take the singular agreement 'is', but evidently contain a semantic sense of plurality. Edit: It would appear to be called "Metonymic merging of grammatical number" - if anyone has any good links on this subject please share.