reason
reason
Latin
“Strangely, reason began as reckoning.”
The English word reason reaches back to Latin ratio, attested in Rome by the 1st century BCE. Ratio first meant a reckoning, calculation, or account, the kind of ordered thinking used in trade, law, and rhetoric. Cicero used it for method, argument, and rational ground. The word already joined number and mind in one frame.
From Latin ratio came accusative rationem, which passed into Gallo-Romance and then Old French as raison by the 11th century. In that move, the sense widened from counted account to explanation, judgment, and intellectual faculty. Anglo-Norman carried raison into England after 1066. English first records reason in the late 12th century.
Medieval writers used reason beside faith, will, and law. In scholastic Latin and French, it named both the power to think and the ground for a claim. That double life stayed alive in English. A person could have reason, and an action could have a reason.
Modern English kept the word broad because its history was broad from the start. It can mean sanity, logic, cause, argument, or moderation. The old counting sense survives faintly in rational and ratio, which are close kin. Reason still carries the Roman idea that thought should be ordered.
Related Words
Today
Reason now means the power to think in a coherent way and also the cause that explains something. English kept both senses because the word entered from a form that already joined judgment with explanation.
In ordinary use, reason can name logic, sanity, motive, or a fair basis for action. The word still implies order: thoughts counted, claims weighed, causes stated. "Order in thought."
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