Here's a breakdown:
* Latin: "ratio" meant "calculation," "reckoning," or "proportion." It was also used to express the idea of "a reasoned account" or "a logical explanation."
* Old French: The word "raison" emerged from "ratio," carrying similar meanings of "reason," "account," or "cause."
* Middle English: The word "reason" entered the English language during this period, inheriting the various meanings from its Old French predecessor.
* Modern English: Today, "reason" primarily refers to the ability to think logically, make sense of things, and form judgments. It can also refer to a justification, explanation, or argument.
So, the origin of the word "reason" can be traced back to the Latin "ratio," meaning "calculation" or "reasoned account," and its evolution through various languages.
The use of "reason" in philosophical and scientific discourse further highlights its central role in human thought and understanding.