- noun the process of making something less, smaller or lower, or of becoming less, smaller or lower
- noun the addition of electrons or hydrogen to a substance
- A chemical reaction in which oxygen is removed from an atom, molecule, ion, or radical. For instance, iron oxide losing oxygen to form iron.
- A chemical reaction in which an atom, molecule, ion, or radical gains one or more electrons. For example, a reaction in which iron combines with oxygen, where the oxygen undergoes a change in valence from 0 to -2.
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