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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
rationalisation is a noun meaning "(psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening". It carries 5 recorded senses.
(psychiatry) a defense mechanism by which your true motivation is concealed by explaining your actions and feelings in a way that is not threatening
psychiatry
the cognitive process of making something seem consistent with or based on reason
(mathematics) the simplification of an expression or equation by eliminating radicals without changing the value of the expression or the roots of the equation
mathematics
the organization of a business according to scientific principles of management in order to increase efficiency
systematic organization; the act of organizing something according to a system or a rationale
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for rationalisation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.