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1. M
noun. concentration measured by the number of moles of solute per liter of solution.
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2. 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.
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3. m
noun. ['ˈɛm'] the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards).