Definition of "fluent"

fluent

/ˈfluːənt/

adjective
comparative more fluent, superlative most fluent
1. That flows; flowing, liquid.
  Quotations
  For time is a fleeting thing, and which appeareth as in a shadow, with the matter ever gliding, alwaies fluent, without ever being stable or permanent […].
  1603, Michel de Montaigne, chapter 12, in John Florio, transl., The Essayes […], book II, London: […] Val[entine] Simmes for Edward Blount […]
2. (linguistics) Able to use a language accurately, rapidly, and confidently – in a flowing way.
  Quotations
  The clerk had, I'm afraid, a shrew of a wife—shrill, vehement, and fluent.
  1863, Sheridan Le Fanu, The House by the Churchyard
noun
plural fluents
1. (mathematics, obsolete) A continuous variable, especially one with respect to time in Newton's Method of Fluxions.