Origin: Latin suffix -tion
Hydration has 2 different meanings across 1 category:
the process of combining with water; usually reversible
"The dehydration of limestone to make quicklime is a chemical change that can be reversed through hydration, which simply means adding water back in."
The incorporation of water molecules into a complex with those of another compound.
"Chemists carefully monitored the hydration process to ensure water molecules successfully integrated into the crystal lattice of the new drug compound."