Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Modern Latin
Origin: Latin rationalis; RATIONAL

rationale

noun
     
ra‧tio‧nale [countable usually singular]
formal the reasons for a decision, belief etc
rationale behind/for/of
The rationale behind the changes is not at all evident.
The rationale for using this teaching method is to encourage student confidence.

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