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fluid (adj.)

early 15c., "liquid, capable of flowing," from Old French fluide (14c.) and directly from Latin fluidus "fluid, flowing, moist," from fluere "to flow" (see fluent). Figurative use, of non-material things, "not fixed or rigid," from 1640s. Related: Fluidly.

fluid (n.)

"substance capable of flowing," 1660s, from fluid (adj.). Related: Fluidal (1869), fluidic (1821, Marmaduke Tulket).

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Definitions of fluid from WordNet
1
fluid (adj.)
subject to change; variable;
a fluid situation fraught with uncertainty
Synonyms: unstable
fluid (adj.)
characteristic of a fluid; capable of flowing and easily changing shape;
Synonyms: runny
fluid (adj.)
smooth and unconstrained in movement;
the fluid motion of a cat
Synonyms: fluent / liquid / smooth
fluid (adj.)
in cash or easily convertible to cash;
liquid (or fluid) assets
Synonyms: liquid
fluid (adj.)
affording change (especially in social status);
Britain is not a truly fluid society
Synonyms: mobile
2
fluid (n.)
a substance that is fluid at room temperature and pressure;
fluid (n.)
continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas;
From wordnet.princeton.edu