Speaking or writing smoothly and easily, without pauses or difficulty; moving or flowing smoothly.
From Latin 'fluens' (flowing), derived from 'fluere' (to flow). Added the adverb suffix '-ly.' Entered English in the 1600s, originally referring to smooth flow of language or water.
The root 'flu' comes from 'flow'—a fluent speaker doesn't stop and start, they flow like water downhill. That's why learning to speak a language fluently means your brain no longer has to stop and think about rules.
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