Full Idea
The 'primary intension' of a concept is a function from worlds to extensions reflecting the way the actual-world reference is fixed, ...which is independent of empirical factors.
Gist of Idea
The 'primary intension' is non-empirical, and fixes extensions based on the actual-world reference
Source
David J.Chalmers (The Conscious Mind [1996], 1.2.4)
Book Reference
Chalmers,David J.: 'The Conscious Mind' [OUP 1997], p.57
A Reaction
This bit is a priori because the concept picks out something, no matter what its essence turns out to be. I take it to be a priori because it is stipulative.
Related Ideas
Idea 8245 The logical attitude tries to turn concepts into functions, when they are really forms or forces [Deleuze/Guattari]
Idea 13959 The 'secondary intension' is determined by rigidifying (as H2O) the 'water' picked out in the actual world [Chalmers]