Dictionary definition · fluid
noun
- a substance that is fluid at room temperature and pressure
- continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
adjective
- subject to change; variable"a fluid situation fraught with uncertainty"
- characteristic of a fluid; capable of flowing and easily changing shape
- smooth and unconstrained in movement"a long, smooth stride"
- in cash or easily convertible to cash"liquid (or fluid) assets"
- affording change (especially in social status)"Britain is not a truly fluid society"
Source: Open English WordNet (CC BY 4.0).