rationale
noun
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If someone asserts that the word rationale refers to a ration of ale, they are wrong, but that doesn’t mean they don’t have an actual rationale (a reason, explanation, or basis) for such a claim. “Rationale looks like the words ration and ale jammed together,” they could offer, and while that is true you’d be justified in responding: “Appearances can be deceiving.” Rationale is a direct borrowing of the Latin word rationale, with which it shares the meaning “an explanation of controlling principles of opinion, belief, practice, or phenomena.” The Latin rationale comes from a form of the adjective rationalis (“rational”), which traces back to the noun ratio, meaning “reason.” While the Latin ratio is also the forebear of the English noun ration, referring to a share of something, rationale has nothing to do with a tankard (or stein, or even a pony) of beer.
Examples of rationale in a Sentence
Erik Ortiz, NBC news, 20 May 2026
The rationale was the board’s view that the president had saved the center, albeit the renovations are being financed by a $257 million fund passed by Congress as part of the One Big Beautiful Bill Act.
—Ted Johnson, Deadline, 19 May 2026
No surprise that the rationale provoked instant social media outrage.
—Kansas City Star, 19 May 2026
These justices have shown no particular alarm or regret over the sweeping attack on Black voting power that has followed their erosion of the VRA, displaying instead a haughty indignation that anyone would criticize their decisions or rationale.
—Adam Serwer, The Atlantic, 19 May 2026
See All Example Sentences for rationale
Cite this Entry
“Rationale.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rationale. Accessed 24 May. 2026.
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rationale
noun
