Full Idea
Possibilities are things of the same general character as possible worlds, on one popular conception of the latter. They differ from worlds, though, in that they are not required to be fully determinate or complete.
Gist of Idea
Possibilities are like possible worlds, but not fully determinate or complete
Source
Ian Rumfitt (The Boundary Stones of Thought [2015], 6)
Book Reference
Rumfitt,Ian: 'The Boundary Stones of Thought' [OUP 2015], p.153
A Reaction
A rather promising approach to such things, even though a possibility is fairly determinate at its core, but very vague at the edges. It is possible that the UK parliament might be located in Birmingham, for example. Is this world 'complete'?