Definitions:

1. A physics theory that unifies all consistent versions of superstring theory. NOUN
   • According to M-theory, ours is not the only universe.
2. Involves an 11-demensional universe where the weak and strong forces and gravity are unified. NOUN
   • M-theory predicts that a great many universes were created out of nothing.

Synonyms:

• braneworld theory
• extra dimensions
• superstring theory