rationalize

Short definition from Wiktionary

Verb

1. 1
   To make something rational or more rational.
2. 2
   To justify a discreditable act, or irrational behaviour.
3. 3
   To remove radicals, without changing the value of an expression or the roots of an equation.
4. 4
   To structure something along modern, efficient and systematic lines, or according to scientific principles. This often includes eliminating duplication and grouping like or similar items.