1. convertible into cash: fluid assets.
2. pertaining to a substance that easily changes its spe; capable of flowing.
3. consisting of or pertaining to fluids.
4. changing readily; shifting; not fixed, stable, or rigid: fluid movements.
5. 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.