adjective

1. that can flow; not solid; able to move and change shape without separating when under pressure
2. of a fluid or fluids
3. like a fluid; that can change rapidly or easily; not settled or fixed fluid plans
4. marked by or using graceful movements
5. available for investment fluid capital
6. available as cash fluid assets

Etymology: ME < L fluidus < fluere, to flow: see fluctuate

noun

1. any substance that can flow; liquid or gas
2. a liquid in the body