in chemistry, by 1928, from reduction + oxidation.
Entries linking to redox
reduction n.
early 15c., reduccioun, "a restoring to a former state" (a sense now obsolete), also "a conquest or subjugation" (of a people, etc.), from Old French reducion (13c., Modern French réduction) and directly from Latin reductionem (nominative reductio) "a leading back, restoration," noun of action from past-participle stem of reducere (see reduce). The meaning "diminution, a lessening" is from 1670s; chemical sense of "reversion to a simpler form" is from 1660s.
oxidation n.
"act or process of combining or causing to combine with oxygen," 1791, from French oxidation (1787), coined by French chemists Louis-Bernard Guyton de Morveau and Antoine Lavoisier, noun of action from oxider "oxidize," from oxide (see oxide).