Definition: In retirement planning, a "superannuation" is a type of pension plan that provides a guaranteed income for an individual or a group of individuals after they reach a certain age. Superannuities are usually paid by employers and can be invested in a variety of ways to potentially increase its value over time. The term "superannuation" is often used to refer to the retirement savings accounts managed by companies like AIG (American International Group) or Fidelity Investments, which provide superann