Full Idea
We might explain the closeness to the truth (or 'verisimilitude') in terms of closeness of possible worlds. A theory is close to the truth to the extent that our world resembles some world where that theory is exactly true.
Gist of Idea
Verisimilitude might be explained as being close to the possible world where the truth is exact
Source
David Lewis (On the Plurality of Worlds [1986], 1.3)
Book Reference
Lewis,David: 'On the Plurality of Worlds' [Blackwell 2001], p.24
A Reaction
[Lewis cites Risto Hilpinen for this thought] I am always puzzled why Lewis and co. talk of whole worlds in their accounts. If I am close to the truth about cooking a good omelette, what has the rest of the world got to do with it?