Full Idea
I'm inclined to think that 'and' is defined by its truth-table (and not, for example, by its 'inferential-role').
Gist of Idea
A truth-table, not inferential role, defines 'and'
Source
Jerry A. Fodor (LOT 2 [2008], Ch.7)
Book Reference
Fodor,Jerry A.: 'LOT 2: the Language of Thought Revisited' [OUP 2008], p.199
A Reaction
Sounds right, on my general principle that something can only have a function if it has an intrinsic nature. The truth-table just formalises normal understanding of 'and', according to what it makes true.