1. A retirement benefit fund, an accumulation of regular deductions from one′s wage or salary while employed and similar regular contributions from the employer, usually administered by an independent entity; a pension.
2. the act or process of being superannuated.

1. the state of being superannuated, or too old for office or business; the state of being disqualified by old age; decrepitude.

1. the condition of being superannuated; disqualification on account of old age; of persons, senility; decrepitude.
2. the state of being superannuated, or removed from office, employment, or the like, and receiving an allowance on account of long service or of old age or infirmity; also, a pension or allowance granted on such account. also used attributively: as, a superannuation list.
3. the state of having lived beyond the normal period.
4. antiquated character.

1. the property of being out of date and not current
2. the act of discharging someone because of age (especially to cause someone to retire from service on a pension)
3. a monthly payment made to someone who is retired from work