The Collaborative International Dictionary
Superannuating
Superannuate \Su`per*an"nu*ate\, v. t. [imp. & p. p. Superannuated; p. pr. & vb. n. Superannuating.] [Pref. super- + L. annus a year.]
To impair or disquality on account of age or infirmity.
--Sir T. Browne.To give a pension to, on account of old age or other infirmity; to cause to retire from service on a pension.
Wiktionary
superannuating
vb. (present participle of superannuate English)