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.
Su′per·an′nu·ate, v. i. To last beyond the year; — said of annual plants. [Obs.] Bacon.