rationalization

Short definition from Wiktionary

Noun

1. 1
   The process or result of rationalizing, or expressing in rational terms.
2. 2
   A statement of one's motives, or of the causes of some event.
3. 3
   The reorganization of a company or organization in order to improve its efficiency through the reallocation of resources and changes in its workforce.
4. 4
   The concealment of true motivation in some non-threatening way.
5. 5
   The simplification of an expression without changing its value.