The Term possible World
The term goes back to Leibniz's theory of possible worlds, used to analyse necessity, possibility, and similar modal notions. In short: the actual world is regarded as merely one among an infinite set of logically possible worlds, some "nearer" to the actual world and some more remote. A proposition is necessary if it is true in all possible worlds, and possible if it is true in at least one.
Read more about this topic: Modal Realism
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“When “reality” is sought for at large, it is without intellectual import; at most the term carries the connotation of an agreeable emotional state.”
—John Dewey (1859–1952)
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