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rationalization (n.)

1825, "a rendering rational, act of subjection to rational tests or principles," from rationalize + -ation. The specific sense in psychology in reference to subconscious means to justify behavior to make it seem rational or socially acceptable is by 1908.

Of the three works now on our table, the two which we have placed first have these laudable objects in view; an improvement on the former versions of the Psalms as compositions, and the rationalization, if we may so speak, of our Church psalmody. [The British Critic, London, Jan.-June 1825]

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Definitions of rationalization from WordNet

rationalization (n.)
the cognitive process of making something seem consistent with or based on reason;
Synonyms: rationalisation
rationalization (n.)
(psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening;
Synonyms: rationalisation
rationalization (n.)
(mathematics) the simplification of an expression or equation by eliminating radicals without changing the value of the expression or the roots of the equation;
Synonyms: rationalisation
rationalization (n.)
the organization of a business according to scientific principles of management in order to increase efficiency;
Synonyms: rationalisation
rationalization (n.)
systematic organization; the act of organizing something according to a system or a rationale;
Synonyms: systematization / systematisation / rationalisation
From wordnet.princeton.edu