i Register
In some senses, fluent is marked as obsolete. Watch for register when choosing this word.
adj
That flows; flowing, liquid.
fluent handwriting
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[…].
Able to use a language accurately, rapidly, and confidently.
She's fluent in French.
The clerk had, I'm afraid, a shrew of a wife—shrill, vehement, and fluent.
Being or relating to a fluent interface.
The payment processor offers a fluent API.
noun
A continuous variable, especially one with respect to time in Newton's Method of Fluxions.