noun

• (UK, Australia, New Zealand) 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.
  "One of the principal objections to it was, that the period of service, after which superannuations were granted, was too limited,[…]."
• (uncountable) The condition or of being superannuated; old age or obsolescence.
  "Those words appearing to be merely the ravings of superannuation, they were not regarded; but when no other traces of Mary could be found, old Andrew went up to consult this crazy dame once more, but he was not able to bring any such thing to her recollection."