Definition of "m-theory" 
- (noun) (particle physics) a theory that involves an eleven-dimensional universe in which the weak and strong forces and gravity are unified and to which all the string theories belong
Use "m-theory" in a sentence
- "Bell's theorem, that you refer to, was produced by a man who realized that it was Einstein who proposed a scientific definition of reality and who suggested a possible way to test it (albeit one that, like superstrings or m-theory does not yet seem amenable to testing.)"
- "We have relativity and quantum mechanics, some theories which have made steps in showing how they can be reconciled, alethic morphologies like string theory and m-theory which are hotly disputed."
- "It showed in one fell swoop that all of these other string theories were actually special cases of the more general m-theory case – essentially different manifestations of a more complete theory."