American Heritage Dictionary
(2)
Century Dictionary
(5)
GNU Webster's 1913
(2)
WordNet
(4)
Elsewhere on the web
A superannuate is one who has become impaired or disabled by length of years.— Orthography As Outlined in the State Course of Study for Illinois
Lord of the Admiralty I'd promote you to-day and superannuate you to-morrow.— The Missing Ship The Log of the "Ouzel" Galley
For superannuate forms and mumping shams,— The Complete Poetical Works of James Russell Lowell
One possible reason for his hasty action is that Gen. Khadka, who is believed to be not opposed to the integration of the PLA into the Army, is due to superannuate in June.— rediff.com
It is not clear why Prachanda decided to force a confrontation with the COAS at this stage instead of waiting till September, when Gen. Katawal is due to superannuate.— IntelliBriefs

American Heritage Dictionary (1)
Century Dictionary (2)
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