Definition: 'MS', or Mathematics, Science, Computer Science, are three separate and distinct subjects in the curriculum. They are: - Math: Topics such as arithmetic, algebra, calculus, geometry, trigonometry, etc. - Sci: Physics, astronomy, biology, chemistry, etc. - Cn: Computer science, software engineering, programming languages. MS is a grade that marks students' understanding of mathematics, science, and computer science subjects. It's typically used to denote an average or percentile score on the subject areas as compared to other classes.