The complete transfer of one or more electrons to a @M03986@ (also called '@E01978@'), and, more generally, the reverse of the processes described under @O04362@ (2) and (3).
Source: PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1160 [Terms] [Paper]