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.

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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. See …

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]

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

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.

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

adj. Hydraulics pertaining to a substance that easily changes its shape; capable of flowing. Hydraulics consisting of or pertaining to fluids. changing readily; shifting; not fixed, stable, or …

Dec 19, 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 …