Webster's English Dictionary

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rationalize

ra.tio.nal.ize \'rash-n*-.li-z, -*n-*l-.i-z\ vt 1: to free (a mathematical 
   equation) from irrational expressions  2a: to make conformable with 
   rational principles  2b: to substitute a natural for a supernatural 
   explanation of  3: to attribute (one's actions) to rational and creditable 
   motives without  analysis of true esp. unconscious motives : to provide 
   plausible but untrue reasons for conduct