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Synonyms
ra·tion·al·ize (răsh́ə-nə-līź)

verb: -ized, -iz·ing, -iz·es. 

transitive verb 

  1. To make rational.
  2. To interpret from a rational standpoint.
  3. To devise self-satisfying but incorrect reasons for (one's behavior): “Many shoppers still rationalize luxury purchases as investments” (Janice Castro)
  4. Mathematics To remove radicals, such as from a denominator, without changing the value of (an expression) or roots of (an equation).
  5. Chiefly British To bring modern, efficient methods to (an industry, for example).

intransitive verb 

  1. To think in a rational or rationalistic way.
  2. To devise self-satisfying but incorrect reasons for one's behavior.

derivatives

rátion·al·iźer
noun