1.Definition: affording change (especially in social status)
"Britain is not a truly fluid society"
2.Definition: characteristic of a fluid; capable of flowing and easily changing shape
3.Definition: in cash or easily convertible to cash
"Liquid (or fluid) assets"
4.Definition: smooth and unconstrained in movement
"The fluid motion of a cat"
5.Definition: subject to change; variable
"A fluid situation fraught with uncertainty"