Minor means "not important", and in Latin "smaller". It may also may refer to an underage child and: Mathematics Minor (linear algebra), for a given matrix, a minor is the determinant of a certain submatrix Minor (graph theory), a graph can be called a minor of another the graph given certain conditions Music Major and minor, general discussion Minor scale, a diatonic scale with a third scale degree at an interval of a minor third above the tonic Minor chord, a chord having a root, a minor thir… (More on Minor)