Full Idea
(Nonsolipsistic) conceptual role semantics is a version of the theory that meaning is use, where the basic use is taken to be in calculation, not in communication, and where concepts are treated as symbols in a 'language of thought'.
Gist of Idea
Take meaning to be use in calculation with concepts, rather than in communication
Source
Gilbert Harman ((Nonsolipsistic) Conceptual Role Semantics [1987], 12.1.1)
Book Reference
Harman,Gilbert: 'Reasoning Meaning and Mind' [OUP 1999], p.207
A Reaction
The idea seems to be to connect the highly social Wittgensteinian view of language with the reductive physicalist account of how brains generate concepts. Interesting, thought I never like meaning-as-use.