rationalization

noun
ra·​tio·​nal·​iza·​tion
variants: also British rationalisation \ˌrash-​nə-​lə-​ˈzā-​shən, -​ən-​ᵊl-​ə-​ \

Medical Definition of rationalization 

: the act, process, or result of rationalizing especially : the provision of plausible reasons to explain to oneself or others behavior for which one's real motives are different and unknown or unconscious

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