Rationalization

(countable and uncountable; plural rationalizations)

The process, or result of rationalizing.
A statement of one's motives, or of the causes of some event.
A reorganization of a company or organization in order to improve its efficiency.
(psychiatry) The concealment of true motivation in some non-threatening way.
(mathematics) The simplification of an expression without changing its value.

(statement of one's motives, or of the causes of some event) reasoning, rationale
(reorganization of a company or organization) consolidation
(concealment of true motivation)
(simplification of a mathematical expression)