- (physics) A candidate unified theory of all physical forces and particles; a theory which suggests that subatomic particles are one-dimensional strings rather than zero-dimensional points. It also suggests that space-time can have up to nine dimensions, plus the dimension of time.
- String theory denies the existence of a hypothetical eleventh dimension.
candidate unified theory of all physical forces and particles
- Burgess & Quevedo, "The Great Cosmic Roller-Coaster Ride", Scientific American, November 2007, pg. 57.