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v To make something rational or more rational.

v 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”(R:30D2aMPV||1949|Washington Square Press|New York||29|4 - Words for Mature Minds )

v (mathematics) To remove radicals, without changing the value of an expression or the roots of an equation.

v To structure something along modern, efficient and systematic lines, or according to scientific principles.