see redox reaction

A chemical reaction in which one substance is oxidised (loses electrons, or loses hydrogen ions and their associated electrons, or combines with oxygen) and a second substance is reduced (gains electrons, or gains hydrogen ions and their associated electron, or loses oxygen).

Reaction in which at least one atom undergoes a change in oxidation state. See metathesis reaction.

A coupled pair of reactions, in which one compound becomes oxidised, while another becomes reduced and takes up electrons released in the oxidation reaction.

A reaction in which one reactant is oxidized (loses electrons) and one reactant is reduced (gains electrons), also called "redox reaction."

Oxidation is loss of electrons, reduction is gain of electrons. The transfer of electrons from the atom that is oxidized to the atom that is reduced. Brown, Theodore L., H. Eugene LeMay, Jr. and Bruce E. Bursten.-8th ed. Chemistry: the central science. New Jersey: Prentice-Hall, Inc, 2000. (Tayolor Whitney)

a reaction in which electrons are transferred between species or in which atoms change oxidation number

A chemical reaction in which one substance loses electrons or hydrogen atoms while, at the same time, another substance gains electrons or hydrogen atoms.