(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 (noun)
WordNet. Princeton University. 2010.
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."