- To make something rational or more rational.
- To structure something along modern, efficient and systematic lines, or according to scientific principles.
- (mathematics) To remove radicals, without changing the value of an expression or the roots of an equation.
- To justify an immoral act, or illogical behaviour. “The process of thought by which one justifies a discreditable act, and by which one offers to oneself and the world a better motive for one's action than the true motive”