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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