m-theory mt. everest • mt. mckinley · · · Info · Definitions · Characters · · m-theory · · Text Common · · Latin · · Scripts 8 · · Length 3 · · Syllables Definitions · · · (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. Synonyms: M-theory. · · Noun Definition 1 Characters · · - hyphen-minus U+002D e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079