Etymology
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superannuation (n.)

1650s, noun of action from superannuate.

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Definitions of superannuation

superannuation (n.)
a monthly payment made to someone who is retired from work;
Synonyms: old-age pension / retirement pension / retirement check / retirement benefit / retirement fund
superannuation (n.)
the property of being out of date and not current;
Synonyms: obsoleteness
superannuation (n.)
the act of discharging someone because of age (especially to cause someone to retire from service on a pension);
From wordnet.princeton.edu