oxidation is the loss of electrons reduction is the gain of electrons Balance the half equation for the formation of aluminium during electrolysis: Al 3+ + e-→ Al. The balanced half equation is: ...

Dinitrogen ligands — key for understanding how atmospheric nitrogen can be reduced — almost exclusively have even-numbered oxidation ... transfer reactions to accomplish the reduction.

For the half equation: Al 3+ + 3e-→ Al, this is described as a reduction reaction as aluminium ions are gaining electrons and the gain of electrons is reduction.