1, coefficient is a numerical factor, which usually refers to a single item in mathematics. For example, the coefficients of -3x2, 2ax and y are -3, 2a, 1 respectively. A number used in science and technology to indicate the degree or proportion of a certain property.

2. In addition, the numerical factor in the single item of algebraic expression is called its coefficient. The sum of the exponents of all the letters in a monomial is called its degree.