I find it interesting that the French expression avoir raison shares an etymology with the English words "reason" and "rational". In a post-truth political era, it is refreshing that the French expression for "being right" is at least etymologically rooted in reason. I wonder, moreover, whether there are connotations of rationality when the French say j'ai raison. In American politics, the words "I'm right" have no connotations of rationality.
Politics aside, the French expression and the English words all derive from the Latin root ratio, rationis. The question I have for this forum is whether the word ratio was frequently used in Roman philosophy, and whether it was used to translate the Greek word λόγος in translations of Greek philosophy. I know what the word means, but I just want to double-check that it's the same word that Roman philosophers used for reason.
Furthermore, are there many Greek and Latin words for "reason" (as, for example, there are many words for "love") or was one word predominantly used to describe this concept?