verb (v)

• defend, explain, clear away, or make excuses for by reasoning(verb.communication)

  Example:
  Rationalize the child's seemingly crazy behavior.
  He rationalized his lack of success.
  

  Synonym:
  apologise, apologize, excuse, justify, rationalise
  

  source: wordnet30
• weed out unwanted or unnecessary things(verb.change)

  Synonym:
  cut, prune, rationalise
  

  source: wordnet30
• structure and run according to rational or scientific principles in order to achieve desired results(verb.possession)

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

  Synonym:
  rationalise
  

  source: wordnet30
• think rationally; employ logic or reason(verb.cognition)

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

  source: wordnet30
• remove irrational quantities from(verb.change)

  Example:
  This function can be rationalized.
  

  source: wordnet30
• To make rational; also, to convert to rationalism.(verb)

  source: webster1913
• To use, and rely on, reason in forming a theory, belief, etc., especially in matters of religion: to accord with the principles of rationalism.(verb)

  source: webster1913