"fluid" in the noun sense
1. fluid
a substance that is fluid at room temperature and pressure
2. fluid
continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
"fluid" in the adjective sense
1. fluid, unstable
subject to change variable
"a fluid situation fraught with uncertainty"
"everything was unstable following the coup"
2. fluid, runny
characteristic of a fluid capable of flowing and easily changing shape
3. fluent, fluid, liquid, smooth
smooth and unconstrained in movement
"a long, smooth stride"
"the fluid motion of a cat"
"the liquid grace of a ballerina"
4. fluid, liquid
in cash or easily convertible to cash
"liquid (or fluid) assets"
5. fluid, mobile
affording change (especially in social status
"Britain is not a truly fluid society"
"upwardly mobile"
Source: WordNet® (An amazing lexical database of English)
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