Standard Lemma guide

M-theory

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

No pronunciation record was provided for this word.

1

noun

Meaning 1

A generalized theory of eleven-dimensional supergravity that attempts to unify the five superstring theories

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

(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

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: model, theoretical account, framework

History

Etymology

Abbreviation of membrane theory.

Across languages

Translations

7 source translations are retained for this English entry.

  • Arabic: ْنَظَرِيَّة-إَم (nḏʕarijjat em) — theory that unifies the five superstring theories
  • German: M-Theorie — theory that unifies the five superstring theories
  • Japanese: M理論 (emu riron) — theory that unifies the five superstring theories
  • Norwegian: M-teori — theory that unifies the five superstring theories
  • Swedish: M-teori — theory that unifies the five superstring theories
  • Turkish: M-Kuramı — theory that unifies the five superstring theories
  • Turkish: M-Teorisi — theory that unifies the five superstring theories