fluent Look up fluent at Dictionary.com
1589, from L. fluentem (nom. fluens), prp. of fluere "to flow," from PIE *bhleug- (cf. L. flumen "river;" Gk. phluein "to boil over, bubble up," phlein "to abound"), from *bhleu- "to swell, well up, overthrow," extension of root *bhel- "to blow, swell" (see bole). Used interchangeably with fluid in Elizabethan times.