Definitions

1. verb

to take in water; to drink water

“She needs to hydrate after her long run.”

2. noun

the process of taking in water to maintain fluid balance in the body

“Hydration is essential during marathon training.”

3. noun

a compound of water with another substance, especially a salt or acid

“The chemical reaction produced a hydrate of calcium carbonate.”

4. verb

to make something more watery or fluid

“The rain helped to hydrate the parched soil.”