Full Idea
A statement S is 'partly true' insofar as it has wholly true parts: wholly true implications whose subject matter is included in that of S.
Gist of Idea
A statement S is 'partly true' if it has some wholly true parts
Source
Stephen Yablo (Aboutness [2014], 01.6)
Book Reference
Yablo,Stephen: 'Aboutness' [Princeton 2014], p.22
A Reaction
He suggests that if we have rival theories, we agree that it is one or the other. And 'we may have pork for dinner, or human flesh' is partly true.