Eloquence or fluency in speaking; the quality of being able to express ideas smoothly and persuasively.
From French 'faconde' (eloquence), derived from Latin 'facundia' (eloquence, from 'facundus' meaning eloquent). The word entered English from French in the medieval period.
Faconde is one of those beautiful old words that captures the idea that speaking well is an art form—it's not just what you say, but the grace and fluency with which you say it!
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