The meaning of FLUID is having particles that easily move and change their relative position without a separation of the mass and that easily yield to pressure : capable of flowing.

fluid adjective (LIKELY TO CHANGE) If situations, ideas, or plans are fluid, they are not fixed and are likely to change, often repeatedly and unexpectedly:

Fluid definition: a substance, as a liquid or gas, that is capable of flowing and that changes its shape at a steady rate when acted upon by a force tending to change its shape..

Aug 7, 2021 · Learn what a fluid is in physics and other sciences. Get the definition and see examples of fluids in everyday life.

Fluid ... In physics, a fluid is a liquid, gas, or other material that may continuously move and deform (flow) under an applied shear stress, or external force. [1]

A situation that is fluid is unstable and is likely to change often. The situation is extremely fluid and it can be changing from day to day.

Fluids flow easily and take on the shape of their containers. All liquids and gases are fluids.

Sep 23, 2025 · fluid (countable and uncountable, plural fluids) Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a …

Sep 11, 2025 · Fluid, any liquid or gas or generally any material that cannot sustain a tangential, or shearing, force when at rest and that undergoes a continuous change in shape when …

Synonyms for FLUID: liquid, flowing, thin, fluent, diluted, weak, semisolid, watery; Antonyms of FLUID: solid, nonliquid, hard, gelatinous, thick, coagulated, clotted, viscous