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.