Full Idea
It is standard to take contents as truth conditions.
Gist of Idea
Content is best thought of as truth conditions
Source
Jaegwon Kim (Philosophy of Mind [1996], p.203)
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.203
A Reaction
This tradition runs from Frege to Davidson, and has been extended to truth conditions in possible worlds. Rivals will involve intentions, or eliminativism about meaning.