possible world

World English Dictionary
possible world
 
n
logic (in modal logic) a semantic device formalizing the notion of what the world might have been like. A statement is necessarily true if and only if it is true in every possible world

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Possible world is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
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