addition of water or of the elements of water (i.e. H and OH) to a molecular entity. For example, hydration of ethene:
The term is also used in a more restricted sense for the process:
See also: aquation, solvation
Compare the use of the term in inorganic/physical chemistry to describe the state of the ions of an electrolyte in aqueous solution.
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1122 (https://doi.org/10.1351/pac199466051077)