- A set of reasons or a logical basis for a course of action or belief: he explained the rationale behind the changeMore example sentences
- Diplomatically, the American is happy to explain the rationale behind his attitude this year.
- Here, its chair and previous vice chair explain the rationale behind the decisions
- But other reasons and rationales exist for adopting and strengthening an historical perspective.
mid 17th century: modern Latin, neuter (used as a noun) of Latin rationalis 'endowed with reason' (see rational).