M

The term "M" could have different meanings depending on the context: 1. In the English alphabet, "M" is the thirteenth letter. 2. In Roman numerals, "M" represents 1000. 3. In physics, "M" can represent mass. 4. In chemistry, "M" can stand for molarity, a unit of concentration. 5. In mathematics, "M" is often used to represent a generic matrix. 6. In finance, "M" can stand for million. 7. In BMW cars, "M" stands for "Motorsport". 8. In music, "M" could be a shorthand for "major" in chord notation. Without specific context, it's difficult to provide a precise definition.