\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.

\Su`per*an"nu*ate\, v. i.
To last beyond the year; -- said of annual plants. [Obs.]
--Bacon.