Full Idea
It's a paradigmatically Pragmatist idea that having a concept consists in being able to do something.
Clarification
A 'paradigm' is a perfect example
Gist of Idea
For Pragmatists having a concept means being able to do something
Source
Jerry A. Fodor (In a Critical Condition [2000], Ch. 3)
Book Reference
Fodor,Jerry A.: 'In Critical Condition' [MIT 2000], p.29
A Reaction
If you defined a bicycle simply by what you could do with it, you wouldn't explain much. I wonder if pragmatism and functionalism come from the same intellectual stable?