Source : Webster's Revised Unabridged Dictionary (1913)

Superannuate \Su`per*an"nu*ate\, v. t. [imp. & p. p.
   {Superannuated}; p. pr. & vb. n. {Superannuating}.] [Pref.
   super- + L. annus a year.]
   1. To impair or disquality on account of age or infirmity.
      --Sir T. Browne.

   2. To give a pension to, on account of old age or other
      infirmity; to cause to retire from service on a pension.

Source : WordNet®

superannuated
     adj 1: discharged as too old for use or work; especially with a
            pension; "a superannuated civil servant" [syn: {retired}]
     2: too old to be useful; "He left the house...for the support
        of twelve superannuated wool carders"- Anthony Trollope
        [syn: {overage}, {overaged}, {over-the-hill}]
     3: old; no longer in use or valid or fashionable; "obsolete
        words"; "an obsolete locomotive"; "outdated equipment";
        "superannuated laws"; "out-of-date ideas" [syn: {obsolete},
         {outdated}, {out-of-date}]