Definitions of rationalize:

• verb:   structure and run according to rational or scientific principles in order to achieve desired results

  Example: "We rationalized the factory's production and raised profits"

• verb:   remove irrational quantities from

  Example: "This function can be rationalized"

• verb:   think rationally; employ logic or reason

  Example: "When one wonders why one is doing certain things, one should rationalize"

• verb:   weed out unwanted or unnecessary things
• verb:   defend, explain, clear away, or make excuses for by reasoning

  Example: "Rationalize the child's seemingly crazy behavior"