multiverse
n.n. the idea that our universe is just one of many possible universes. It suggests that every choice or event creates a new version of reality.
n. the hypothetical set of multiple possible universes, including our own, which together constitute all of physical reality. Often discussed in the context of quantum mechanics and theoretical physics.
The theory of the multiverse suggests we are not alone.
Physicists are debating whether the multiverse theory can ever be proven by observing the cosmic microwave background.
If the multiverse theory is correct, then every possible outcome of every decision exists simultaneously in a different branch of reality, challenging our traditional understanding of probability.
First appeared c. 1895. Blend of multiple + universe, coined by American philosopher William James. By surface analysis, multi- + -verse.