Definition of Possible worlds

Possible Worlds may refer to:

• Possible Worlds (play), by John Mighton
  • Possible Worlds (film), by Robert Lepage, based on the Mighton play
• Possible Worlds (poetry book), by Peter Porter
• Possible Worlds (book), by J. B. S. Haldane

In philosophy and logic, the concept of possible worlds is used to express modal claims. In philosophy, the term "modality" covers such notions as "possibility", "necessity", and "contingency". Talk of possible worlds is very widespread in contemporary philosophical discourse (especially in the English-speaking world), though much about them is disputed.