Full Idea
Truth is a property of a proposition from which one can deduce the fact stated by the proposition.
Gist of Idea
Truth is the property of propositions that makes it possible to deduce facts
Source
Colin McGinn (Logical Properties [2000], Ch.5)
Book Reference
McGinn,Colin: 'Logical Properties' [OUP 2003], p.96
A Reaction
This is McGinn's explanation of the disquotational account of truth ('p' is true iff p). The redundancy theorist would reply that you can deduce p from 'p' without mentioning truth, but it remains to ask why this deduction is possible.