Aquation is the chemical reaction involving "incorporation of one or more integral molecules of water" with or without displacement of other atoms or groups.
[1] The term is typically employed to refer to reactions of metal complexes where an anion is displaced by water.
For example, bromopentaamminecobalt(III) undergoes the following aquation reaction to give a metal aquo complex:[2] This aquation reaction is catalyzed both by acid and by base.
Acid catalysis involves protonation of the bromide, converting it to a better leaving group.
Base hydrolysis proceeds by the SN1cB mechanism, which begins with deprotonation of an ammonia ligand.