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fluent (adj.)

1580s, "flowing freely" (of water), also, of speakers, "able and nimble in the use of words," from Latin fluentem (nominative fluens) "lax, relaxed," figuratively "flowing, fluent," present participle of fluere "to flow, stream, run, melt," from extended form of PIE *bhleu- "to swell, well up, overflow" (source also of Latin flumen "river;" Greek phluein "to boil over, bubble up," phlein "to abound"), an extended form of root *bhel- (2) "to blow, swell." Used interchangeably with fluid (adj.) in 17c. in the sense "changeable, not rigid." Related: Fluently.

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Definitions of fluent

fluent (adj.)
smooth and unconstrained in movement;
Synonyms: fluid / liquid / smooth
fluent (adj.)
expressing yourself readily, clearly, effectively;
Synonyms: eloquent / facile / silver / silver-tongued / smooth-spoken
From wordnet.princeton.edu