Full Idea
For Prior, so the moral goes, we must first have a notion of what 'and' means, independently of the role it plays as premise and as conclusion.
Gist of Idea
We need to know the meaning of 'and', prior to its role in reasoning
Source
report of Arthur N. Prior (The Runabout Inference Ticket [1960]) by Nuel D. Belnap - Tonk, Plonk and Plink p.132
Book Reference
'Philosophical Logic', ed/tr. Strawson,P.F. [OUP 1973], p.132
A Reaction
The meaning would be given by the truth tables (the truth-conditions), whereas the role would be given by the natural deduction introduction and elimination rules. This seems to be the basic debate about logical connectives.