Full Idea
The meaning of an expression is the product of both its actual meaning (what helps determine its instances and counter-instances), and its potential meaning (the possibilities for making it more precise).
Gist of Idea
Meaning is both actual (determining instances) and potential (possibility of greater precision)
Source
Kit Fine (Vagueness, Truth and Logic [1975], 2)
Book Reference
'Vagueness: a Reader', ed/tr. Keefe,R /Smith,P [MIT 1999], p.131
A Reaction
A modal approach to meaning is gloriously original. Being quite a fan of real modalities (the possibilities latent in actuality), I find this intuitively appealing.