1.a substance that is fluid at room temperature and pressure
2.a continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas
3.subject to change; variable;
a fluid situation fraught with uncertainty
4.characteristic of a fluid; capable of flowing and easily changing shape
5.smooth and unconstrained in movement;
a long, smooth stride
6.in cash or easily convertible to cash;
liquid (or fluid) assets
7.affording change (especially in social status);
Britain is not a truly fluid society