fluid

2. A fluid is also a gas, like air, that can flow.

Air is a fluid that moves around us all the time.

3. Something fluid can change easily and is not fixed.

Her plans for the weekend were fluid, so she could change them anytime.

4. A fluid is a drink or liquid in the body.

The doctor told him to drink plenty of fluids when he was sick.

5. A fluid movement is smooth and graceful.

The dancer made a fluid motion with her arms.