1. A unit of plane angle equal to 1/360th of a complete revolution.
2. A division on a temperature scale.
3. The power to which a variable is raised. If one expression contains several variables the overall degree of the expression is the sum of the powers. For example, the expression p2q3r4 has a degree of 9 overall (it is a second-degree expression in p). The degree of a polynomial is the degree of the variable with the highest power, e.g. ax5 + bx4 + c has a degree of 5.
4. The highest power to which the derivative of the highest order is raised in a differential equation. For example, (d2y/dx2)3 + dy/dx = c is a differential equation of the third degree (but second order).
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